Answer:
No, evolution from simple origins is not impossible. Evolution by natural selection, which is a well-established scientific theory, proposes that species can change over time through small genetic variations that confer a survival advantage. Over many generations, these variations can accumulate, leading to the development of new species with increasingly complex characteristics. This process can explain the diversity and complexity of life on Earth today.
which of the following best describes evolution? the disappearance of a species. there is competition for resources. a change in a population over time. survival of the fittest.
Survival of fittest best describes evolution. Evolution is the method by which a species changes over time to accommodate its environment.
Evolution is the shift in a biological population's heritable traits over successive generations. These traits are the expressions of genes, which are passed down through reproduction from parent to offspring. Genetic recombination and mutation frequently result in variation within a population. This variety is subjected to evolutionary processes like natural selection (including sexual selection) and genetic drift, which cause some traits to become more or less prevalent within a population. This is when evolution happens. Heritable traits evolve over successive generations as a result of shifting evolutionary forces that determine whether a trait is prevalent or rare within a population.
The phrase "survival of the fittest," popularised in Charles Darwin's fifth edition of On the Origin of Species (published in 1869), argued that animals most adapted to their environment have the best chances of surviving and procreating. In this theory, he provided an explanation of how to thoroughly and accurately characterise the mechanism and process of natural selection. The reproductive success of an organism can be used to gauge the effectiveness of this physical biology principle.
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in a hypothetical environment, fishes called pike-cichlids locate their prey by sight and eat small, immature algae-eating fish. thus, the population of algae-eaters experiences predatory pressure from pike-cichlids. which of the following possible changes is least likely to occur in the algae-eater population in future generations?
Female algae eaters may grow bigger and produce larger and more numerous broods.
The larger size of the female algae eaters is a conspicuous trait, and since predators hunt by sight, they will be able to quickly recognize the fishes. A crucial part of repopulating the decimated population of preyed animals is played by larger female fish that have better broods.
As it is said that populations of fish that eat algae are threatened by predation, populations of large broods will only increase if predators are able to release large fish. This demonstrates that these would be less likely to be found among the population of algae eaters.
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Estimate the specimen size below if the low power lens was used. The circle indicates the field of view. 1.8 mm
0.9 mm 90 um 180 um
180 um would be the deemed specimen size. A specimen is a piece of matter, an organism, or some other object that has been taken for scientific investigation.
Typically, specimens are utilized in testing, research, and teaching settings. Biological samples like blood, tissue, and cells as well as inanimate items like rocks, minerals, and fossils are examples of specimens. The size of the specimen and the lens's power are inversely proportional. Less lens power is required to see a specimen the larger it is. In contrast, a stronger lens is required to observe a specimen that is smaller in size.
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Match each of the following items that may influence the selection of an antimicrobial procedure with its correct description/rationale.
1. Composition of the item
2. Risk for infection
3. Type of microbe
4. Environmental conditions
5. Number of microorganisms
Environmental conditions, such as temperature and humidity, can impact the efficacy of certain procedures and need to be considered as high antimicrobial loads may require stronger treatments.
The selection of an antimicrobial procedure involves considering various factors to ensure its effectiveness and safety. The composition of the item to be treated is important as Environmental conditions , such as food or medical devices, may be more susceptible to contamination and require specific treatments to prevent the growth of microbes. The type of microbe present on the item is also important, as different microbes have varying sensitivities to antimicrobial agents. Environmental conditions, such as temperature and humidity, can also impact the efficacy of certain procedures and must be considered in the selection process. Finally, the number of microorganisms on the item is significant as high antimicrobial loads may require stronger treatments.
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select the situations in which the weight of the person is zero. multiple select question. an astronaut far from any planets, moons, or asteroids an astronaut aboard the international space station a skydiver an astronaut exactly between two identical asteroids
The weight of a person is defined as the force of gravity acting upon the person's mass.
Weight is determined by the mass of an object and the strength of the gravitational field it is in. In the case of an astronaut far from any planets, moons, or asteroids, they would technically have zero weight because they are in a state of free-fall, meaning they are being acted upon by gravity but are not being supported by any solid surface. However, this does not mean that the astronaut has no mass.
Similarly, an astronaut aboard the International Space Station is in a state of microgravity, and although they technically have zero weight, they still have mass. On the other hand, a skydiver is affected by gravity, and therefore has weight, while falling towards the ground. The same applies to an astronaut exactly between two identical asteroids, as they are under the influence of gravity from both objects, and therefore have weight.
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The power given off by the Sun is 4 × 1026 watts. One study showed that the city of Los Angeles uses 3 × 108 watts of power on average.
Approximately one trillion cities can be powered if we could use all of the power from the Sun.
What is Power?Power is the amount of energy which is transferred or converted per unit time in a system. In the International System of Units, the unit of power is the watt (W). Watt is equal to one joule per second. Power is a scalar quantity because it has only magnitude and no direction.
Power given by sun = 4 × 1026 Watts
Power used by Los Angeles = 3 × 10⁸ Watts
Number of cities like Los Angeles = n
n = n = Sun.power/ Los Angeles. Power
n = 4 × 1026/ 3 × 10⁸
n = 1.333 × 10⁸ ≈ 1 × 10¹⁸
(Approximately 1 trillion)
1 trillion cities could be powered if all the power of sun put out is used.
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Your question is incomplete, most probably the complete question is:
The power given off by the Sun is 4 × 1026 watts. One study showed that the city of Los Angeles uses 3 × 108 watts of power on average. How many cities like Los Angeles could be powered if we could use all the power our Sun puts out?
What is a drought?
a warm season brought on by Earth tilting toward the Sun
an extended period of time with little to no snow or rainfall
a large wave usually caused by an undersea earthquake
a cool season brought on by Earth tilting away from the Sun
As two different hormones reach the same cell they counteract the effect of one another. This outcome is known as a(n) ________.
As two different hormones reach the same cell they counteract the effect of one another. This outcome is known as an antagonistic effect.
A biological reaction to exposure to numerous chemicals is less severe than what would be predicted if the known effects of the individual substances were combined together. This is called a dose-dependent response.
Antidotes for poisonings and other medical therapies are frequently based on substances that have antagonistic effects. For instance, ethyl alcohol, also known as ethanol, can counteract the harmful effects of methyl alcohol, often known as methanol, by displacing it from the enzyme that is responsible for oxidizing the methanol.
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fill in the blank. your diaphragm is in its relaxed, arc-shaped confirmation when breathing out, so this means that that pressure within your lungs is___when compared with the atmospheric pressure outside of the body.
The main muscle used for breathing is the diaphragm, which is situated underneath the lungs.
This is a large, dome-shaped muscle which frequently contracts unconsciously and regularly. The diaphragm flattens and tightens during inhalation, as well as the chest cavity widens. A vacuum is produced by the contraction, drawing oxygen into the lungs. Air is driven out of the lungs during exhalation when the diaphragm relaxes & assumes its original form. This contraction generates a vacuum, which draws air into the lungs. Air is driven out of the lungs when the diaphragm relaxes and assumes its dome-like form during expiration. The reduction in thoracic volume and rise in intraalveolar pressure during expiration are caused by the relaxation of a diaphragm and elastic tissue rebound. The act of exhaling forces air from the lungs.
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An example of a biomarker is A. cholesterol. B. any DNA sequence. C. sodium chloride. D. hydrogen
A biomarker is a pharmacologic reaction to an intervention or a normal biological or pathologic process. An example of a biomarker is cholesterol.
The body uses cholesterol to make hormones, sustain cell structure, and preserve neurons. It is made by your liver and received from the consumption of animal items such as meat, cheese, and egg yolks.
The cholesterol biomarker panel is used to measure cardiovascular health. High cholesterol levels are linked to artery plaque formation, which raises the risk of cardiovascular disease.
LDL-C (low-density lipoprotein cholesterol) is a common cardiovascular biomarker. Biological plausibility was established several decades ago, and a substantial link between LDL-C and coronary artery disease (CAD) was revealed.
Several major clinical trials have now demonstrated that lowering LDL-C clearly reduces the risk of CAD-related clinical events. LDL-C as a surrogate end goal remains popular since it accurately reflects the clinical impact of treatments through this method.
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A parent cell has six chromosomes.
Which statement describes the daughter cell(s ) produced after this cell undergoes the cell cycle and mitotic cell division?
If a parent cell has six chromosomes, then the statement b. there will be two daughter cells with six chromosomes each describes the daughter cell(s ) produced after this cell undergoes the cell cycle and mitotic cell division.
What is the cell cycle and mitotic cell division?The cell cycle and mitotic cell division make reference to the life of a somatic cell that divides by mitosis generating two genetically identical cells.
Therefore, with this data, we can see that the mitotic cell division generates two daughter cells with the same genetic material.
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Enzymes use several types of catalytic mechanisms. Differentiate between acid-base catalysis, covalent catalysis, and metal ion catalysis. (If you answer any part of this question incorrectly, a single red X will appear indicating that one or more of the phrases are sorted incorrectly.) (Place the correct definitions in the correct categories (there are 4 categories), acid-base, covalent, metal or all):
catalysts may participate in oxidation-reduction reactions by changes in the oxidation state
a Zn2+ cofactor may properly orient the substrate in the active site through ionic interactions
may take part in interactions involving Fe2+
lowers the energy or stabilizes the transition state or intermediate
catalyst retains its original form after reaction occurs
a proton is transferred between enzyme and substrate
a covalent bond forms between enzyme and substrate
two-part catalytic process (for example, the chymotrypsin mechanism)
use a nucleophilic function group
may use amino acids such as aspartate or lysine for protonation or proton abstraction
The differentiation between acid-base catalysis, covalent catalysis, and metal ion catalysis is given below:
The DifferentiationAcid-base catalysis
a proton is transferred between the enzyme and substratemay use amino acids such as aspartate or Lysine for protonation or proton abstractionCovalent catalysis
a covalent bond is formed between enzyme and substratetwo-part catalytic process (for example; chymotrypsin mechanismuses a nucleophilic functional groupMetal ion catalysis
catalysts may participate in oxidation-reduction reactions by changes in the oxidation state.a Zn2+ cofactor may properly orient the substrate in the active site through ionic interactions.May take part in interactions involving Fe2+All
lowers activation energy or stabilizes the transition state or intermediatecatalyst retains its original form after the reaction occursRead more about covalent catalysis here:
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scientists use a general process known as the blankto ask and answer questions about nature.target 1 of 4 2. a(n) blank is a proposed explanation for a set of observations. it leads to predictions that can be tested by additional observations or by experiments.target 2 of 4 3. a(n) blank involves running a test multiple times while changing one variable, leaving the others the same.target 3 of 4 4. a(n) blank is broader in scope than a hypothesis, is supported by a large body of evidence, and generates many new hypotheses.
scientists use a general process known as the scientific method observations to ask and answer hypotheses questions about nature.
A hypothesis is a proposed explanation for a set of observations. It leads to predictions that can be tested by additional observations or by experiments. An experiment involves running a test multiple times while changing one variable, leaving the others the same. A observations theory is broader in scope than a hypothesis, is supported by a large body of evidence, and generates many new hypotheses.
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which of the following statements about species, as defined by the biological species concept, is (are) correct? i. biological species are defined by reproductive isolation. ii. biological species are the model used for grouping extinct forms of life. iii. all members of a species can potentially interbreed.
Option i, iii are Correct. According to the biological species idea, the following statements concerning species are true:
i. Reproductive isolation characterizes biological species.
iii. There is a chance that all members of a species could interbreed.
"A population must be reproductively isolated from other species in order to be designated a species." The biggest population unit in which gene flow is conceivable is the biological species, which is defined by reproductive isolation.
It mostly depends on reproductive seclusion. The idea of a biological species was put forth by Ernst Mayr. This group defines a species as a collection of living things with the ability to breed with one another and produce fruitful offspring.
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What motion of the skeleton involves putting your hand out straight and then turning it over and back again?
Pronation is the motion of the skeleton muscle which involves putting your hand out straight and then turning it over and back again.
What is Pronation?Pronation is the motion which moves the forearm (hand) from the anatomical position to the pronated position or palm backward. This motion of the forearm is produced by the rotation of the radius at the proximal radioulnar joint of the forearm, accompanied by movement of the radius at the distal radioulnar joint of the hand.
Overpronation is linked to several conditions and symptoms, such as Achilles tendinitis. Achilles tendinitis happens when we put stress on the Achilles tendon. Bunions are the painful bony lumps on the outside of the big toe. Heel pain can have pain behind, beneath or within the heel bone.
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TRUE/FALSE. different cell types develop in a multicellular organism because each cell has its own unique set of genes.
FALSE. When cells divide, genetic material is transferred to the daughter cells. Through the process of cell division, new cells are created from existing ones. Cells are the basic unit of life.
RNA and protein molecules are synthesized and accumulated by various cell types in multicellular organisms, which causes these cell types to develop differences from one another. They typically carry out this activity without changing the DNA's sequence.
An old set of frog experimentation provides proof that the genome is preserved during cell differentiation. A fully differentiated frog cell's nucleus can direct the recipient egg to develop a typical tadpole when it is injected into a frog egg that has had its nucleus removed (Figure). The differentiated donor cell cannot have lost any significant DNA sequences because the tadpole contains a full range of differentiated cells that derived their DNA sequences from the nucleus of the original donor cell. In experiments using different plants, a similar conclusion was drawn. Here, differentiated plant tissue fragments are placed in culture before being separated into individual cells.
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1. List the order in which rock layers formed and events occurred A
through E.
2. How can you tell that intrusion D is older than fault E?
3. Using relative dating methods, which of the following are scientists
able to do?
a. Identify the order in which rock units formed.
b. Assign a numerical date to each rock layer studied.
c. Determine the age of the fossils within each layer.
d. Identify what rock types are present.
PLEASE HELP
Answer:
1. B, A, D, E
2. the intrusion is not lined up
3. a
Explanation:
When a protein encoding gene is transcribed, the RNA molecule that is produced is referred to as ______ RNA (mRNA)
The majority of genes found in a cell's DNA dictate the amino acid composition of its proteins; these genes' translated products, known as messenger RNA (mRNA) molecules.
They ultimately control how proteins are made. By means of the transcription and translation processes, messenger RNA (mRNA) is a type of RNA that carries genetic information from DNA to protein. Making an RNA copy of a gene's DNA sequence is a process known as transcription in the context of genomics. The messenger RNA (mRNA) copy carries the DNA-encoded protein information for the gene.
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Which of the following lists the parts of a reflex arc in the correct sequence? Multiple Choice receptor, afferent neuron, efferent neuron, Interneuron, effector O effector, receptor, afferent neuron, efferent neuron, Interneuron receptor, afferent neuron, Interneuron, efferent neuron, effector effector, afferent neuron, receptor, Interneuron, efferent neuron
Answer:
it is the 3rd one
Explanation:
fill in the blank. reddish-pink color of these algae is due to presence of ___pigments, which absorb blue light, while reflecting ___light. those pigments protect the chloroplast from intense ___light and also blank radiation, as well as absorbing ___, which provides the alga with liquid water as the snow melts around it.
These algae are reddish-pink in hue because they contain carotenoid pigments, which absorb blue light while reflecting red light.
These pigments shield the chloroplast from UV and bright blue light while also absorbing heat, which helps the alga produce liquid water when the snow melts around it.
Because of the pigment phycoerythrin, which reflects red light and absorbs blue light, red algae are red. The principal pigment in photosynthesis, chlorophyll, absorbs red and blue light the most effectively while reflecting green light.
In chloroplasts, which also house the pigment and algae chlorophyll, photosynthesis occurs in plants. The function of chlorophyll in a plant is to absorb light, typically sunlight. Two different types of energy-storing molecules receive the energy that light absorbs.
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HELP PLEASE Holly's parents both have brown hair and brown eyes. Her mother has pale skin and always wears her hair in a ponytail, but her father has dark skin and keeps his hair cut very short. Which trait can Holly not inherit from her parents?
A. hair color
B. hairstyle
C. eye color
D. skin color
mitochondria are thought to have evolved from ancient bacteria. which characteristics of a free-living bacteria have mitochondria lost over time? question 10 options: motility ribosomes an independent genome phospholipid membranes ribosomes, phospholipid membranes, motility, and an independent genome
Motility characteristics of a free-living bacteria have mitochondria lost over time
A mitochondrion is a kind of organelle present in the cells of most eukaryotes, including mammals, plants, and fungi. Mitochondria have a double membrane structure and employ aerobic respiration to produce adenosine triphosphate (ATP), which is used as a source of chemical energy throughout the cell. Albert von Kölliker identified them in the voluntary muscles of insects in 1857 .
Carl Benda invented the name mitochondrion in 1898. The mitochondrion is commonly referred to as the "powerhouse of the cell," a term originated by Philip Siekevitz in a 1957 essay of the same title.
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Full Question :Mitochondria are thought to have evolved from ancient bacteria. Which characteristics of a free-living bacteria have mitochondria lost over time?
1. ribosomes
2. motility
3. phospholipid membranes
4. an independent genome
5. ribosomes, phospholipid membranes, motility, and an independent genome
the primary feature distinguishing human intelligence from that of intelligent animals like dolphins and chimpanzees is
Humans differ from most other creatures in that they are self-aware. Self-awareness is characterized in psychology as metacognition, or awareness of one's own ability to think.
Humans are thought to be the most intellectual living species on the planet. Animals lack the ability to think and react to situations like humans do. In comparison to animal brains, the human brain is considered enormous.
While measuring intelligence in any organism is challenging, numerous studies indicate that dolphins are second only to humans in intelligence. Dolphins are second only to humans in terms of brain-to-body size ratio when using brain size as a barometer. Dolphins, on the other hand, perform well on IQ tests.
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Which of the following describes a common feature of F-actin, microtubules and intermediate filaments? a) filaments are all made of up monomeric subunits b) filaments provide tracks for molecular motors c) filament assembly depends on ATP hydrolysis d) filament assembly depends on GTP hydrolysis e) filaments are all polar structures
Option b is Correct. The fact that filaments serve as tracks for molecular motors is what the next sentence refers to as a characteristic of intermediate filaments, microtubules, and F-actin.
Similar to actin filaments, microtubules are dynamic structures that can quickly expand and contract by the addition or subtraction of tubulin proteins. Microtubules exhibit directionality, which means they have two structurally distinct ends, making them similar to actin filaments in this regard.
For mobility and stability, this structure serves as a skeleton and muscle at the same time. The cytoskeleton's long fibers are polymers of subunits. The cytoskeleton is made up primarily of intermediate filaments, microfilaments, and microtubules. Actin filaments and microtubules are constructed of compact and globular actin subunits, whereas intermediate filaments are composed of smaller, elongated, and fibrous subunits.
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true/false. birth control pills contain a combination of estrogen and progesterone that signal the pituitary gland to not release follicle-stimulating hormone and luteinizing hormone which results in the ovary not releasing an egg for fertilization.
True. Birth control pills, also known as oral contraceptives, contain a combination of estrogen and progesterone hormones.
These hormones signal the pituitary gland to not release follicle-stimulating hormone and luteinizing hormone, which in turn results in the ovary not releasing an egg for fertilization. This mechanism of action is one of the ways that birth control pills prevent pregnancy. However, it is important to note that birth control pills do not protect against sexually transmitted infections.
Birth control pills are a commonly used form of contraception. They work by containing a combination of estrogen and progesterone hormones that signal the pituitary gland to not release follicle-stimulating hormone and luteinizing hormone, which prevents the ovary from releasing an egg for fertilization. This mechanism of action is effective in preventing pregnancy.
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the following graphic shows the major steps of gene expression. place the following descriptions of the steps in the correct order.
A strand of DNA's information gets replicated into a fresh messenger RNA molecule through a process called transcription (mRNA). The correct order of the given statements according to the graphic representation is D, A, C, E, and B.
DNA preserves genetic material as a reference or template safely and permanently in the cell nucleus. A complementary strand of mRNA is produced after the transcription of genetic information from DNA. A protein chain is created as a result of the amino acids joining together and finally separating from the ribosome. The ribosome transports mRNA, an intermediary molecule, from the nucleus. DNA, which is found in the nucleus, acts as a blueprint for the expression of genes. The ribosome in the cytoplasm translates the mRNA and its codons, which designate a tRNA containing certain amino acids.
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The complete question is:
The following graphic shows the major steps of gene expression. Place the following descriptions of the steps in the correct order.
A) The genetic information is transcribed from DNA into a complementary strand of mRNA.
B) The amino acids bind together to form a growing protein chain that eventually breaks off from the ribosome.
C) mRNA, an intermediate molecule, leaves the nucleus to the ribosome.
D) Located in the nucleus, DNA serves as the template for gene expression.
E) In the cytoplasm, mRNA and its codons are translated at the ribosome and specify a tRNA carrying specific amino acids.
Why would a change in the numbers of producers (for example phytoplankton ) cause a large change to the rest of an ecosystem
Answer:
Explanation:
A large change in the number of producers(for example phytoplankton) would have a huge effect on the rest of the ecosystem because there would be so much phytoplankton that fish would feed so much and keep increasing their population and sharks would eat so much of the fish that the sharks would be increasing their population rapidly. If the change in producers increases, then the rest of the population on the planet increases.
Which describes a convergent plate
boundary?
A. when plates do not move
B. when plates come together and collide
C. when plates move away from each other
D. slab pull
When two plates slide past each other, they form a transform boundary. Transform boundaries are also known as strike-slip boundaries, in which motion is predominantly horizontal. For example, San Andreas fault.
What is divergent boundary?A divergent boundary occurs when two plates pull away from each other. The divergent boundary is formed when the plates are moving apart and a new crust is formed by pushing the mantle.
When two plates collide with each other, they form a convergent boundary. The colliding of two plates causes the edges to buckle up to form mountain ranges or deep-sea trench.
Therefore, When two plates slide past each other, they form a transform boundary. Transform boundaries are also known as strike-slip boundaries, in which motion is predominantly horizontal. For example, San Andreas fault.
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which of the following are true regarding strcuts and classes? select all that apply both support private and public members as well as member functions
c. A struct variable is passed by value only, and a class variable is passed by reference only.
In C#, the difference between a struct and a class is mainly how they are stored in memory. Structs are stored in the stack and classes are stored in the heap. This leads to some important differences between the two: Structs are passed by value and classes are passed by reference. This means that when a struct is passed as a parameter to a method, a copy of the struct is created and the method operates on the copy. When a class is passed as a parameter, a reference to the class is passed instead of a copy. Structs do not support inheritance, while classes do. Structs cannot have a default constructor, while classes can.
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The complete Question is:
Which of the following is true about classes and structs?
Select one:
a. An assignment operator is allowed on class variables, but not on struct variables.
b. By default, all members of a struct are public and all members of a class are private.
c. A struct variable is passed by value only, and a class variable is passed by reference only.
d. You cannot use the member access specifier private in a struct.
select the organ systems most closely associated with maintaining homeostasis in the human body. a)respiratory. b) urinary. c) reproductive. d) cardiovascular. e) digestive
a) respiratory b) urinary d) cardiovascular e) digestive maintain homeostasis in the human body.
Homeostasis is a condition in which all bodily systems are in balance and working as they should.
Each and every organ system in the body depends on homeostasis. In a similar vein, no single organ system of the body functions alone; at the very least, the cardiovascular, neurological, musculoskeletal, and integumentary systems must all work together for body temperature regulation to take place.
The body must constantly check its internal circumstances in order to maintain homeostasis. Each physiological situation has a certain set point, including body temperature, blood pressure, and the quantities of particular nutrients. The physiological value that the normal range varies around is known as a set point.
Hormones are chemical messengers that the brain uses to communicate with the body and regulate homeostasis. The bloodstream carries hormones from the brain to the body and back.
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