Stone tools are more commonly found on archaeological sites thought to be associated with Homohabilis.
Homohabilis are our ancestors having the same genus as us Homo, there are the extinct species that resided in the South Africa approx 2.3 million years ago. They were about 5 feet (1.52 m) tall and were the first ones to make use of stone to make tools. Also known as handy man due to the fact they could make stone tools.
Studies suggest that these were majorly vegetarian and didn't include meat in their diet. Technically speaking they were the first humans on this earth and therefore referred to as belonging to the genus Homo. Many fossils found all over the globe states many facts about their human nature.
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The cells that line the respiratory tract are ____________ , allowing them to sweep debris back up the throat, keeping the lungs clean.
The cells that line the respiratory tract are ciliated, allowing them to sweep debris back up the throat, keeping the lungs clean.
The respiratory tract is the set of organs and ducts that form the structure in which the process related to human respiration takes place.
The respiratory tract is divided into lower and upper, the lower respiratory tract is formed by the trachea, the bronchi and their branches inside the lungs, the bronchioles, and the upper respiratory tract is formed from the nose, the mouth to the vocal cords, and includes the pharynx and the larynx.
What is a cell?A cell is the most basic and smallest form of life that exists in a living being, its parts are the membrane, the cytoplasm and the organelles including the nucleus.
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__________ amino acids are those amino acids that do not need to be obtained from the diet because the body is capable of synthesizing (producing) them.
how will different additives affect hydrogen bonds between different water molecules (soap, sugar, oil)? CER question
Soap is a surfactant, or a compound that lowers the surface tension of a liquid. Soap, in particular, decreases the surface tension of water by weakening the hydrogen bonds that make water such a special substance.
The three sugars interacted with water molecules in different ways. Mannose, the least sweet of the sugars, formed longer and weaker hydrogen bonds with water than glucose or fructose. Fructose, the sweetest of the sugars, formed the shortest and strongest hydrogen bonds with water.
Oil molecules, however, are non-polar, and they can't form hydrogen bonds. If you put oil and water in a container, the water molecules will bunch up together and the oil molecules will bunch up together, forming two distinct layers.
What is the bond called between the two different types of atoms of water?Opposites attract, so this lopsided charge difference allows bonds to form between the hydrogen and oxygen atoms of adjacent H2O molecules. Each H2O can bind to a maximum of four neighbors through these so-called hydrogen bonds.
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Strong epidemiologic evidence that cigarette smoking was a major case of heart disease existed long before there was any biological evidence. True or false
Answer:
Strong epidemiologic evidence that cigarette smoking was a major case of heart disease existed long before there was any biological evidence is true.
Explanation:
According to a report which was presented in 2014 on cigarettes and health, smoking is a significant factor in cardiovascular disease (CVD), also it accounts for around one in four fatalities due to CVD. CVD is the most common kind of over 800,000 individuals die from this cause in the US every year. Heart disease affects more than 16 million people in the US. Nearly 8 million people used to have a stroke, while 7 million people suffered a heart attack. Smokers who consume less than five cigarettes per day may still display signs of earliest CVD The more cigarettes smoked, the higher the risk of CVD. daily and for an extended period of time. having a cigarette with reduced amounts of tar or nicotine did not lower the risk for cardiovascular disease.
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Changes in the biological system is most likely to cause changes in the ________.
Changes in the biological system is most likely to cause changes in the Psychological and societal systems
What is psychosocial conflict?Erikson believed that these conflicts were caused by either failing to develop a psychological characteristic or succeeding in doing so. The potential for personal development is greatest at these periods, but failure is also a real possibility.
Individuals organise and interpret their sensory perceptions through the process of perception in order to give their surroundings meaning.
The term "psychosocial development" simply refers to how a person's own needs (psycho) interact with societal expectations (social). A human goes through eight developmental phases, each of which builds on the one before it, in accordance with Erikson. We encounter a problem at every step.
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Which type of fracture involves a break through only part of the cross-section of the bone?
A type of fracture that involves a break through only part of the cross-section of the bone is called an incomplete fracture.
A fracture is an incomplete or complete break in the continuity of the bone structure. When a bone is subjected to great stress, more than it can absorb, it breaks, resulting in a fracture.
When only part of the bone gets cracked or broken it is called an incomplete fracture. Other types of fractures include:
Complete fracture: this is a breakthrough the whole cross-section of the bone. Closed fracture: in this type of fracture does not result in a tearing or opening of the skin.Open fracture: this occurs when a fracture results in the opening or breaking of the skin.Learn more about fractures here:
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is table salt a compound? how can you tell?
Answer: Salt is an ionic compound, consisting of a crystal, lattice structure of the two ions Na+ and Cl-. Salt water is full of sodium chloride molecules.
Explanation:
hope this helps
Answer:
Chemically, table salt consists of two elements, sodium (Na) and chloride (Cl). Neither element occurs separately and free in nature, but are found bound together as the compound sodium chloride.
HOPE IT'S HELPS YOUWhat happens if you are following the scientific method and after your experiment, your hypothesis is found to be incorrect?
A. you should give up on the problem because you got the answer wrong
B. you should think of a new question to study
C. you should make an observation
D. you should refine, alter, expand or reject your hypothesis and then develop a new prediction
Answer:
D
Explanation:
Don't give up! Keep trying to make a correct hypothesis.
Answer:
I took the test and it was “D”
Explanation:
I also put some pics below with things that could help out a bit in the future.
Kelly, who is blind, switches on the fan in her room without anyone's help. she is able to do this because the ________ relays the relevant information to her brain.
Kelly, who is blind, switches on the fan in her room without anyone's help. she is able to do this because the Somatic nervous system relays the relevant information to her brain.
Nervous system :According to the classical doctrine of the nervous system, an animal's nervous system is a highly sophisticated component that coordinates its movements and sensory data by sending and receiving signals to and from various regions of its body.
Somatic nervous system :The somatic nervous system, also known as the voluntary nervous system, is the area of the peripheral nervous system responsible for the voluntary control of skeletal muscle movement.
A part of the peripheral nervous system called the somatic nervous system is responsible for the voluntary control of skeletal muscle movement.
Example somatic nervous systemThe cranial nerves, which transmit information from the brain to the head and neck region, are an illustration of the somatic nervous system. In this area, conscious motor functions are under the control of the somatic nervous system.
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Which characteristic of a phospholipid contributes to the fluidity of the membrane?
The characteristic of a phospholipid that contributes to the fluidity of the membrane is the unsaturation of lipids.
Phospholipid is the most common type of lipid present in the plasma membrane. It contains the phosphate group in its polar head. The phospholipids that are present in the membrane are: phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin.
Unsaturation of lipids is the presence of double bonds in the fatty acid chain. One of the fatty acid chain is unsaturated while the other is saturated. This gives a kink in the lipid structure. This kink prevents the tight packing of the lipid in the plasma membrane, thereby contributing in its fluidity.
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In the gel electrophoresis lab, you determined the ________ of three different dna samples. complexity phenotype reactivity function genotype
Answer:
Explanation:
genotype
What is one of the simplest checks for overall mobility, and is commonly used by usa weightlifting for athlete preparation, and to test readiness for the snatch specifically?
Apley's test ,Toe touch test Overhead squat Sit and reach flexibility test 66.The Apley scratch take a look at is a shoulder flexibility, used to assess the power and mobility of your shoulder joint. The also can be used to evaluate the variety of motion (ROM) of your shoulder, inclusive of flexion and extension.The Apley returned scratch particularly assessments the mobility of your shoulders. The intention of the shoulder flexibility take a look at is to save you hyperextension of the joint.
Hyperextension can cause an acute or continual damage of the rotator cuff muscle group, inclusive of supraspinatus, infraspinatus, teres minor, and subscapularis. These rotator cuff accidents may be due to repetitive movements, including the ones worried with swimming, tennis, volleyball, racquetball, or any game that calls for throwing or catching.1
Monitoring assessments are normally used to evaluate weightlifter’s preparedness for competition. Although diverse tracking assessments were used, it isn't always clean which take a look at is the most powerful indicator of weightlifting performance.
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Khalil is working toward a career in government service. what job would be in the field that khalil is interested in?
(a) sous chef for a catering business.
(b) student teaching in middle school.
(c) organizer for the parks department.
(d) hvac repairman.
Khalil is working toward a career in government service. the job that would be in the field that Khalil is interested in is an organizer for the parks department.
What are government services?
Government Service means development providing municipal, provincial, or federal services directly to the public. This use class doesn't include protective and emergency services, minor or major impact utility services, and public education services.
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Genes serve as a template and are transcribed into ______, a temporary message that can travel out of the nucleus. multiple choice question. rna chromosomes cells dna
Genes serve as a template and are transcribed into RNA, a temporary message that can travel out of the nucleus.
What is RNA ?All living cells contain ribonucleic acid (abbreviated RNA), a nucleic acid with properties comparable to those of DNA. However, RNA is often single-stranded, unlike DNA. Instead of the deoxyribose present in DNA, the backbone of an RNA molecule is made up of alternating phosphate groups and the sugar ribose.
RNA transmits genetic information that ribosomes interpret into a variety of proteins required for biological functions. The three primary RNA subtypes involved in protein synthesis are mRNA, rRNA, and tRNA. RNA is also used by viruses as their main genetic component.Learn more about RNA here:
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why did it take more than 150 years for scientists to appreciate the discoveries of hook and Leeuwenhook?
The chemical messengers released into the synaptic gap between neurons are called?
In addition to transporting oxygen from the lungs to the tissues, hemoglobin is also involved in transporting carbon dioxide from the tissues to the lungs. how is this accomplished?
The correct option is (C) Carbon dioxide reacts with an amino group to stabilize the deoxyhemoglobin state.
In addition to transporting oxygen from the lungs to the tissues, hemoglobin is also involved in transporting carbon dioxide from the tissues to the lungs where, Carbon dioxide reacts with an amino group to stabilize the deoxyhemoglobin state.
How does hemoglobin contribute to the movement of carbon dioxide from the tissues to the lungs?The transport of carbon dioxide in the blood is influenced by a number of factors. First, blood contains more carbon dioxide soluble molecules than oxygen. The plasma contains 5–7% of the total dissolved carbon dioxide. Second, carbon dioxide can enter red blood cells and bind to hemoglobin or it can bind to plasma proteins. In this form, 10% of the carbon dioxide gets transported. A substance known as carbaminohemoglobin is created when carbon dioxide binds to hemoglobin. Hemoglobin and carbon dioxide can bind to one other again. As a result, when it gets to the lungs, the carbon dioxide can separate from the hemoglobin without restriction and leave the body.Third, the bicarbonate buffer system is responsible for transporting 85% of the carbon dioxide molecules.Learn more about the CO₂ transfer with the help of the given link:
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I understand that the question you are looking for is "In addition to transporting oxygen from the lungs to the tissues, hemoglobin is also involved in transporting carbon dioxide from the tissues to the lungs. How is this accomplished?
A. Carbon dioxide competes for the oxygen-binding site on the heme.
B. Carbon dioxide competes for the 2,3-BPG-binding site.
C. Carbon dioxide reacts with an amino group to stabilize the deoxyhemoglobin state.
D. Carbon dioxide binds to the carboxyl terminus of hemoglobin."
The inability to recognize familiar faces even though one can clearly see and describe features of the faces is associated with damage to the right ________ lobe.
A. frontal
B. parietal
C. occipital
D. temporal
Some eukaryotic cells move by the restructuring of microfilaments. this enables the cells to send out long projections of the cytoplasm covered in cell membrane. what are these projections called?
This type of projection is called pseudopodia
A pseudopod is a momentary, armlike extension of the membrane of a eukaryotic cell that faces the direction of motion. Actin filaments make up the majority of the cytoplasm filled pseudopodia, which may also contain microtubules and intermediate filaments.
Pseudopods are employed for ingestion and motility. Pseudopodia enable a cell to move along a substrate by pulling or crawling. Amoeboid movement is the term used to describe cell movement via pseudopodia.
Broad, flat pseudopodia called lamellipodia are employed for locomotion. A mesh like internal network is sustained by microfilaments that form at the leading edge.
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________________ encourage the growth of good bacteria in the large intestines and an example of a good bacteria is _________________.
Probiotics encourage the growth of good bacteria in the large intestines and an example of a good bacteria is lactobacillus.
Probiotics are a combination of microorganisms that are naturally present in the body and have an important role in the well-being of the body so are considered to be consumed or applied to the body, especially for the health of the gut including the intestines. Prebiotics maintain the intestinal flora and boost the immune system.
Prebiotics are generally useful in conditions of diarrhea, infections, irritable bowel syndrome, and high blood pressure.
Lactobacillus is a rod-shaped gram-positive bacteria that produces lactic acid which promotes glucose production and protects the genital tract of females therefore it is considered a good bacteria. In cases of deficiency of lactobacillus in the body, there is an increased risk of sexually transmitted infections.
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Neuroscientists study the nervous systems of other animals such as slugs, snails, fruit flies, rats and monkeys because:_______.
Neuroscientists study the nervous systems of other animals such as slugs, snails, fruit flies, rats, and monkeys because all animals are related so if we study them we will know more about human brain.
A neuroscientist is someone who is curious about the human brain, its functions, physiology, morphology, how it behaves etc. They study all the facts and acquire knowledge by working on different projects including different insects and animals to unravel the mysteries of human mind.
The study revolves around the functioning of the nervous system and all of its different cells that are involved and the people that study them are called neuroscientist, who may or may not be a person from the medicine stream.
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A thin layer of tissue called the _____ covers the brain's two hemispheres, collectively known as the _____.
A thin layer of tissue called the cerebral cortex covers the brain's two hemispheres, collectively known as the cerebrum.
What is the cerebral cortex?The cerebral cortex is a layer of the cerebrum that covers both the right brain hemisphere and the left brain hemisphere associated with the highest skills as motor functions.
In conclusion, a thin layer of tissue called the cerebral cortex covers the brain's two hemispheres, collectively known as the cerebrum.
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The meristemoid cells in plants are similar to __in humans since they can not generate all types of tissues.
The meristemoid cells in plants are similar to blastocyst cells in humans since they can not generate all types of tissues and is denoted as option A.
What is Blastocyst cell?This is usually in the form of a ball which is produced within days of the sperm fertilizing the egg which is usually before implantation in the uterus.
On the other hand, meristemoid cells are self renewing and undergo series of divisions in other to form a larger cell. Balstocyst only generates the three types of primary germ layers which include:
EctodermMesodermEndodermThe meristemoid and blastocyst cells can't generate all types of tissues which is why it was chosen.
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The options are;
a) blastocyst cells
b) totipotent cells
c) adult stem cells
4) This morning you got up and ate a huge bowl of cereal. It gave you lots of energy that
your body was able to access quickly. What is the main macromolecule powering this jolt
of energy?
a) Carbohydrates
b) Lipid
c) Both
d) None of the above
C
Which disease is caused by a bacteria that resides in the soil, can create spores under certain environmental conditions, and is primarily a disease of animals?
Anthrax is a bacteria that resides in the soil, can create spores under certain environmental conditions and is primarily a disease of animals.
Anthrax is an infectious disease most commonly found in cattle, sheep, and goats. It is transmitted by feed or water with spores and the symptoms start to occur after 7 to 8 days.
These infections enter through cuts or abrasions on the skin. At first, a bump appears on the skin and then a 3-centimeter wide ulcer. Humans can also contract anthrax if they stay in constant touch with infected animals.
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The chief inhibitory neurotransmitter in the brain is ____, and the chief excitatory neurotransmitter is ____.
The chief inhibitory neurotransmitter in the brain is GABA and the chief excitatory neurotransmitter is Glutamate.
Gamma-aminobutyric acid (GABA) is an amino acid that serves as the central nervous system's main inhibitory neurotransmitter (CNS). By preventing nerve transmission, it works to lower neuronal excitability. When GABA attaches to the GABA receptor protein in your brain, it exerts a relaxing effect. Anxiety, worry, and fear can all be relieved with the use of this. The most prevalent excitatory neurotransmitter in the brain and central nervous system is glutamate. You require it to maintain optimal brain function. Glutamate has a significant impact on how learning and memory are shaped. Glutamate must be present at the proper concentrations, locations, and times.
The main distinction between glutamate and GABA is that L-glutamic acid decarboxylase produces GABA from glutamate.
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Identify the reasons why meiosis leads to significant genetic variation while mitosis does not. select the two correct reasons.
Please be rightly informed that meiosis leads to significant genetic variation while mitosis does not simply because
Meiosis produce chromosomes and crossing over provide a large amount of genetic variation.Meiosis produces a unique combination of genes.Option b and c are the two correct answer
This is possible simply because there is an independent assortment of the genetic materials which contains a unique and different combination of genes
What is cell division?Living organisms be it plants or animals need to produce new cells for replacement, growth and development and other life processes, the process by which all these occur is known as cell division.
However, the functions and importance of cell division cannot be overemphasized as it helps greatly in
Formation of gamatesReproductionGrowth formation.So therefore, meiosis leads to significant genetic variation while mitosis does not simply because
Meiosis produce chromosomes and crossing over provide a large amount of genetic variation.Meiosis produces a unique combination of genes.Complete question:
Identify the reasons why meiosis leads to significant genetic variation while mitosis does not. select the two correct reasons.
a. Meiosis produces the same combination of genes.
b. Meiosis produce chromosomes and crossing over provide a large amount of genetic variation.
c.Meiosis produces a unique combination of genes.
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In the fourth week after conception, a miniscule blood vessel that will become the _____ begins to pulsate.
Heart
In the fourth week after conception, a miniscule blood vessel that will become the heart begins to pulsate.
In four weeks following conception, what is happening?The embryo grows and expands inside the lining of your womb throughout the first few weeks of pregnancy, between weeks 4 and 5.Your blood vessel network is connected by the outer cells' extension outward.Two inner cells eventually split into three layers.Has a heartbeat been detected at four weeks?When expecting parents hear their unborn child's heartbeat for the first time, they are filled with excitement.A vaginal ultrasound can spot the first indications of a baby heartbeat as early as five and a half to six weeks after conception.How early can a healthy pregnancy be identified by an ultrasound?The earliest a healthy pregnancy inside the uterus can be detected by an ultrasound screening is 17 days after the egg was released from the ovary (ovulation). This is around three days after a menstruation was missed.To learn more about gestation visit:
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They have a daughter who is a dwarf with normal color vision. what is the probability that she is heterozygous for both genes?
The probability that the daughter is a heterozygote for both genes is 1.0
What is achondroplasia dwarfism?
The fibroblast growth factor receptor is a protein in the body that is impacted by the genetic disorder achondroplasia. This protein starts to behave incorrectly in a condition called achondroplasia, which slows the formation of bone in the growth plate cartilage.
As achondroplasia dwarfism is an autosomal dominant disorder it will be passed on to the daughter.
What is red-green color blindness?
The most prevalent form of color blindness is red-green color blindness. This disorder, also known as deuteranopia, is most likely a congenital one. In this, the person is unable to distinguish between red and green colors.
As this disease is X-linked and the mother is affected hence it will be transmitted to her daughter.
Hence, the daughter will carry the genes for both diseases and thus will be heterozygote.
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