what is science to you?
Answer:
the intellectual and practical activity encompassing the systematic study of the structure and behavior of the physical and natural world through observation and experiment.
Explanation:
when do mammals and dinosaurs appear in the rock sequence? Label this point appearance of mammals and dinosaurs
In the Triassic period, mammals and dinosaurs appear in the rock sequence.
During which period did mammals first appear?The first mammal appear in the fossil record during the late Triassic period, which is about 225 million years ago. The Triassic period is also known as the first period of the Mesozoic era. This period started from 251.9 to 201.3 million years ago. This era is popularly known as the “Age of Reptiles” because reptiles and dinosaurs were the dominant land animals at that time and they are present in large population due to good environmental conditions and large availability of food resources. We know that dinosaur extinct due to unavailability of food and bad environment.
So we can conclude that In the Triassic period, mammals and dinosaurs appear in the rock sequence.
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4. Carbon dating would work best on which of the following items?
Oan animal bone from 100,000 years ago
a stone tool from 2000 years ago
O a wood tool from 100 years ago
a neanderthal bone from 40,000 years ago
The carbon dating technique would only be best for a Neanderthal bone from 40,000 years ago.
What is carbon dating?
Organisms are known to exchange [tex]^{14} C[/tex] with their environment while they are alive. There are two types of carbon isotopes which are carbon 12 and carbon -14.
The carbon -14 is known to be radioactive. As such, the decay of the carbon - 14 isotope could be used to obtain the age of the sample of the radioactive sample.
Again, it is known that the limit of the accuracy of the carbon-14 system of dating technique lies around 50 000–60 000 years. It then follows that the carbon dating technique would only be best for a Neanderthal bone from 40,000 years ago.
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How do chromosomes line up differently in meiosis compared to mitosis? A. They line up in a straight line of 92 chromosomes. B. They lineap with their duplicated homologous pair to form a tetrad. C. They line up with the duplicated chromosome one on top of the other. D. They line up with the chromosome from the same parent.
Is the C. They line up with the duplicated chromosome one on top of the other
Chromosomes line up differently in meiosis compared to mitosis as they line up with the duplicated chromosome one on top of the other. Therefore, the correct option is C.
During mitosis the chromosomes align differently than during meiosis. Homologous chromosomes pair up and join during the first stage of meiosis, known as prophase I. Two sister chromatids, which are identical copies made by DNA replication, make up each homologous chromosome. A quadrivalent or bivalent is the name of the structure formed by these paired homologous chromosomes.
Therefore, the correct option is C.
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Which of the following is NOT accurate concerning ionization?
O In the compound MgCl2, Cl gains an electron to become negative.
O In the compound NaCl, Na loses an electron to become positive.
When an atom loses an electron, it becomes negatively charged.
When one atom loses electrons, another must gain electrons.
O lonic bonds form between ionized atoms.
lonic bonds form between ionized atoms.
Ionic bonds, also known as electrovalent bonds, are a type of linkage created in a chemical molecule by the electrostatic attraction of ions with opposing charges. When the valence (outermost) electrons of one atom are permanently transferred to another atom, a bond of this kind is created. If an atom gains electrons, it becomes a negatively charged ion (cation), while if it loses them, it becomes a positively charged ion (cation) (anion). Following is a quick discussion on ionic bonds. Ionic or electrovalent compounds are produced via ionic bonding, and the compounds generated between nonmetals and alkali and alkaline-earth metals serve as the best examples of this type of compound.
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In TV shows and movies, the word mutant refers to characters born with abilities unusual for humans. What do you think scientists mean when they talk about a genetic mutation?
Do you think all genetic mutations are harmful? Explain your answer.
Answer:
A gene variant is a permanent change in the DNA sequence that makes up a gene. This type of genetic change used to be known as a gene mutation,but not all genetic mutations are harmful .The majority of mutations have neither negative nor positive effects on the human or the organism itself.
Explanation: (In the answer as well)
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State two criteria of a scientific hypothesis.
Explanation:
cientific hypothesis
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scientific hypothesis, an idea that proposes a tentative explanation about a phenomenon or a narrow set of phenomena observed in the natural world. The two primary features of a scientific hypothesis are falsifiability and testability, which are reflected in an “If…then” statement summarizing the idea and in the ability to be supported or refuted through observation and experimentation. The notion of the scientific hypothesis as both falsifiable and testable was advanced in the mid-20th century by Austrian-born British philosopher Karl Popper.
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Germany and Italian have your Sanskrit for has a
8. Indicate how you would make 300 ml of 1X PBS (phosphate buffered saline) from a 20X PBS stock
solution.
Concentrate must be diluted 20 times with distilled water to create a 1X PBS solution. A mixing flask should be filled with the proper volume of 20X PBS concentrate before adding water to reach the desired volume. Stir only once. The pH of the 1X solution must be 7.6 & 0.2.
A common isotonic solution used in biological research is phosphate-buffered saline (PBS). Add 100 mL of 10X PBS to 900 mL of water to create 1 L of PBS. [tex]137 mM NaCl[/tex], [tex]2.7 mM KCl[/tex], [tex]10 mM - Na_{2} HPO_{4}[/tex], and [tex]1.8 mM KH_{2} PO_{4}[/tex]are all present in this PBS mix.
Concentrations for 1X PBS Solutions:
[tex]NaCl - 137 mM[/tex]
[tex]Na_{2} HPO_{4} - 10 mM[/tex]
[tex]KH_{2} PO_{4} - 1.8 mM[/tex]
[tex]KCl - 2.7 mM[/tex]
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Which statement is true of all scientific laws?
OA. They were established by scientists hundreds of years ago.
OB. They are factual explanations that cannot be questioned.
C. They describe nature through the past, present, and future.
OD. They must be based on mathematical formulas to be valid.
C
They describe nature through the past , and future
Which statement is true? DNA forms a double helix; RNA consists of a single strand. DNA forms a single strand; RNA consists of a double helix. RNA forms a double strand; DNA consists of a single helix. RNA forms a double strand; DNA consists of a double helix
RNA forms a double strand; DNA consists of a single helix. RNA forms a double strand -TRUE
Perhaps the most significant molecules in cell biology are deoxyribonucleic acid (DNA) and ribonucleic acid (RNA), which store and read the genetic information that is the basis of all life. Both are linear polymers made up of sugars, phosphates, and bases, but they differ in a few significant ways.
These differences allow the two molecules to cooperate and perform their fundamental functions. Here, we examine 5 significant distinctions between DNA and RNA. All genetic information is encoded in DNA, which also serves as the building block for all biological life.
And only in the near future. In the long run, DNA serves as a storage medium, a biological flash drive that enables the transmission of the genetic code from one generation to the next.
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Nelly was reading about
The diatoms organism is the subject of the article, and they are utilized as insecticides since they are abrasive against pests.
The correct option is B.
What are diatoms?Diatoms are a type of photosynthesising algae that can be found practically wherever that is moist, including soils, freshwater bodies of water, and the ocean. They contain a siliceous skeleton called a frustule. Diatoms are categorized as eukaryotes, which distinguish them from prokaryotes like bacteria and archaea by having a nuclear envelope-bound cell nucleus.
What kind of diatom is an example of?The following are some prominent diatoms: A mucilaginous layer covers the elongated, elliptical pinnular diatom. The genus is a member of the order Naviculales, class Bacillariophyceae, and family Pinnulariaceae.
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The complete question is-
Nelly was reading about ecological pesticides. She found a website that said that skeletons of some organisms settle as sediments in the ocean. They are then used as pesticides because they are abrasive against pests. Which organism is the article discussing?
a-dinoflagellates
b-diatoms
c-green algae
d-euglenoids
e-amoeba
try to classify the following stem growth forms.
The endocrine system works closely with the _________
system to bring about homeostasis in the body.
O respiratory
O cardiovascular
O immune
O nervous
In 1650, an individual calculated that earth was about 6,000 years old. How did the discovery of fossils in rock layers around the globe change scientists' understanding of earth's age?
A.They discovered that earth was significantly younger than previously thought.
B.They could better estimate the relative age of rocks based on fossils.
C. The fossils allowed scientists to precisely determine the absolute age of rock.
D. They determined that the same organisms had been on earth for a long time.
The discovery of fossils in rock layers meant that they could better estimate the relative age of rocks based on fossils. Option B
What are fossils?The term fossils is used to describe the organisms that have lived and died whose remains could be found in rock formations around the work. We know that intricate records of the organism that have existed on the earth over time could be found in rocks.
The ages of these organisms play a key role in the determination of the age of the rock and ultimately the age of the earth. The earth has been found to be much older than the 6000 years estimate given in the question.
As such, the discovery of fossils in rock layers around the globe helped scientists to better estimate the relative age of rocks based on fossils.
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This graph shows that-
Pepsin is an enzyme which breaks down proteins into smaller peptides.
The enzyme trypsin, located in the first section of the small intestine, starts the breakdown of protein molecules by chopping these long chains of amino acids into smaller pieces.
This graph shows that-
The graph below displays the rate of Trypsin and Pepsin enzyme activity in relation to ph. Both enzymes disintegrates molecules in the food that the body absorbs.
Pepsin is one among the primary digestive enzymes in the digestive systems of humans and many other animals, where it aids in the breakdown of the proteins in food. It is produced in the gastric chief cells of the stomach lining. It is produced by the gastric glands of the stomach which works in an acidic environment.
In the digestive systems of several animals, trypsin, a serine protease from the PA clan superfamily, hydrolyzes proteins. It is produced by the exocrine glands of the pancreas and works in an alkaline environment.
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D Learning Task No.2: Use the GRESA Method in solving the problem below. Show your solutions. Write your answers in your notebook. 1. What is the mass of the cart with a constant net force of 200N is exerted to accelerate from rest to a velocity of 40m/s in 10 s. C. 50 kg D. 500 kg 2. A. 0.5 kg B. 5 kg What is the acceleration of a ball with a mass of 0.40 kg is hit with a force of 16N? A. 0.4 m/s² C. 400 m/s² D. 4000 m/s² B. 40 m/s² 3. What is the external net force exerted on a 3.5 kg papaya, which is being pushed across a table and has an acceleration of 2.2 m/s² to the left? A. 7.0N to the left C. 7.7N to the left B. 7.5N to the right D. 7.7N to the right 4. What is the mass of a crate with a net force of 300N and accelerate it by 0.750 m/s²? A. 0.4 kg B. 4 kg C. 40 kg D. 400 kg
GRESA method stands for given, required, equation, solution and answer.
We are required to solve the question according to the GRESA method. However, the question has multiple sub questions and hence we will solve each one of them separately.
Question 1:
Given:
Net force of 200N
initial velocity is 0 m/s
final velocity is 40 m/s
time is given to be 10 s
Required:
We are required to find the mass of the cart.
Equation:
By using Newton's second law of motion,
F= m x (v-u)/t
Solution:
By putting all the values, we get:
200N = m x ( 40 -0 ) / 10
m = 200 /4 = 50kg
Answer:
The weight of the cart is 50kg.
Hence option (c) 50kg is correct
QUESTION 2:
Given:
mass of ball = 0.4 kg
force of hitting = 16N
Required:
We are required to find the acceleration of the ball after hitting
Equation:
Using Newton's law of motion,
F = m x a
Solution:
By putting all the values, we get:
16 = 0.4 x a
a =16/0.4 = 40 m/s^2
Answer:
Hence option (B) 40 m/s^2 is the correct answer
QUESTION 3:
Given:
mass of papaya =3.5kg
acceleration of papaya = 2.2 m/s^2
Required:
We are required to find the net force applied
Equation:
Using Newton's law of motion,
F = m x a
Solution:
By putting all the values we get:
F = 3.5 x 2.2
=7.7 N
Answer:
The external force applied is 7.7 N to the left
Question 4:
Given:
net force = 300N
acceleration = 0.750 m/s^2
Required:
We are required to find the mass of the crate
Equation:
By using Newton's second law of motion,
F= m x a
Solution:
By putting all the values, we get:
300 = m x 0.750
m = 300/0.750
= 400kg
Answer:
Hence the weight of crate is 400kg
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(04.02 MC)
Regions that have similar climate characteristics can be widely spread apart, but typically have which of the following in common?
Biomes are geographical areas with comparable climatic conditions and dominant plant species.
The tropical forests, savannas, deserts, temperate grasslands, temperate deciduous woods, Mediterranean scrub, coniferous forests, and tundra are only a few of the major terrestrial biomes discussed in this chapter.
The five main climate zones of the world are tropical, dry, mid-latitude, high-latitude, and highland.The quantity of sunshine a location receives, its elevation above sea level, the form of the land, and how close it is to oceans are just a few of the many variables that affect its climate. The climate varies with distance from the equator because the equator receives more sunshine than the poles.Temperature and precipitation are the two main determinants of a region's climate.Due to variations in the different factors that determine the weather, such as wind speed, humidity, etc., the weather varies more frequently than climate does.Learn more about climate here:
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How do density dependent and density independent factors differ in there effects on population growth. Give some examples of each. Please help
The difference between density dependent and density independent factors in terms of their effects on population growth and common examples are described below.
What is density dependent and independent factors?Limiting factors are conditions that limit the growth or abundance of a population of organisms in an ecosystem.
There are two types of limiting factors that can affect population growth and they are as follows:
Density dependent factorDensity independent factorDensity dependent factors are factors that regulate the population growth by mechanisms controlled by the size of the population while density independent factors affect population growth irrespective of size of the population.
Density dependent factors limit the growth of a population as the population increases while density independent factors limit the population growth irrespective of whether there is an increase in population or not.
Examples of density dependent factors are as follows:
PredationCompetitionDisease and parasitesWaste accumulationExamples of density independent factors are as follows:
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A psychological disorder is characterized in part by A) stability in everyday functioning B ) cognitive , behavioral , or emotional dysfunction C ) behavior that is common in the culture D ) a typical response to an abnormal event
dentify the role of the hypothesis in science
Answer:
The hypothesis is your prediction of an experiment that can disprove or corroborate the findings. It is written before the experiment and is the theory of the observation.
Explanation:
What types of measurements can Susie make on the plants to determine how they did in different types of light
The height of the plant under different types of light should be measured.
What is the height of the plant?In an experiment, we seek to determine how a cause leads to an effect. In this case, Susie is trying to know the effect of different types of light on the growth of a plant.
It is true that the easiest way to measure the growth of the plant is to look at the height of the plant. This shows us the extent to which the plant grows.
Let is recall that in this case, the height of the plant is the dependent variable while the kind of light is the independent variable. As the kind of light is changed, the height of the plant which is an indicator of the growth of the plant changes also and this is the crux of what Sarah is studying.
Thus, the type of measurement that Susie should make on the plants to determine how they did in different types of light is to measure the height of the plant under the different types of light.
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BRAINLEST GOES TO WHOEVER ANSWERS CORRECTLY
Answer: 3 Oxygen atoms
Explanation:
The subscript next to "O" is 3. Therefore 3 oxygen atoms. See attached
Free electrons are bound to the nucleus and they orbit along the outermost shell.
O True
O False
Answer:
False
Explanation:
Hence, electrons revolving in the valence shell or outermost shell of an atom are called free electrons. Hence the given statement is false
Which cycle mostly takes place underground
Answer:
Nitrogen cycle
Hope this helps :)
Explanation:
Lots of the nitrogen on earth is underground, in plants and soil.
similarities between ecosystem approach and ecosystem management
Explanation:
balances both human and nature's needs
protect and mange the environment
protecting the earth and its species from potential harm
The similarities between the ecosystem approach and ecosystem management are:
Balances both human and nature's needsprotect and manage the environmentprotecting the earth and its species from potential harmWhat is an ecosystem approach?The ecosystem approach is the term by which the management of the animals and plants and other living resources. The conservation or property use of these resources comes under an ecological approach.
The management of ecological services and biological resources is managed under this management system. This system also sees what extent these resources are using.
Thus, the similarities between them are:
Maintain and manage the environment.Protects the earth and its species from potential harm.Balances human and natural requirements.To learn more about the ecosystem approach, refer to the link:
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A cinder cone volcano easily erodes because it is made of ash and other volcanic debris. This indicates that its eruption is primarily _____.
A) explosive with a pyroclastic flow B) non-explosive with a pyroclastic flow C) explosive with pyroclastic and lava flows D) non-explosive with a lava flow
PLEASE HELP GIVING BRAINLIEST TO FIRST CORRECT ANSWER
A cinder cone volcano easily erodes because it is made of ash and other volcanic debris. This indicates that its eruption is primarily explosive with a pyroclastic flow.
Volcanoes with cinder cones are the most basic. They are made of lava chunks and blobs that were ejected from a single vent.
A single vent is surrounded by a conical formation of ash, tephra, and solidified lava called a cinder cone. After being ejected into the air from the vent, volcanic debris breaks apart and falls to the ground, forming the cone. As the ash and lava cool and solidify, they form a cone around the vent.
The height of a cinder cone can range from 10 to hundreds of meters, and its summit frequently features a bowl-shaped crater. They differ from spatter cones, which are made of agglomerated volcanic bombs, in that they are made of loose pyroclastic material (cinder or scoria) and hence eruption is primarily explosive with a pyroclastic flow.
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Explain how injury can cause disease in pets.
Injuries can cause disease in pets because when the pets get hurt, some body parts are showing up which allows germs to enter the body. As a result, the pet gets sick.
Glad to help. :)
Answer:
Let's say a dog is in a race. This dog falls and gets scraped. If the injury consists of an open wound, that would leave a big opening for diseases to get in. Diseases can be harmful to the way pets function, just like us humans. If your pet is injured, do anything you can to treat it.
What is true of a population? Select all that apply.
A. All members have the same density.
B. All members live at the same time.
V
C. All members are the same size.
D. All members are the same species.
E. All members live in the same area.
Answer:
B, D, and E
Explanation:
A population is a group of the same species that live in the same area. But since not all animals are the same size, it couldn't be A or C.
150-word explanation of how different types of dietary fat affect our cardiovascular health.
Dietary fats are rich in lipid composition. They lower the good cholesterol and contribute to bad cholesterol in the blood stream. This narrows the lumen of the arteries and hence is responsible for various heart ailments.
What are cardiovascular diseases?Cardiovascular diseases are the heart related disorders in which the functioning of the heart is affected.
Cardiovascular diseases are mainly the outcome of poor heart heath due to poor dietary habits, lack of exercise and stress. High consumption of fatty food also contributes to cardiovascular diseases.
Hypertension, Angina, coronary artery diseases, Atherosclerosis are some of the cardiovascular diseases.
Thus, cardiovascular diseases require a timely management for healthy life.
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What would be the result if you had a hypotonic solution with a cell in it?
O Equilibrium would be met by salt rushing out of the cell.
O Equilibrium would be met by salt rushing into the cell.
O Equilibrium would be met by water rushing out of the cell.
O Equilibrium would be met by water rushing into and out of the cell evenly.
O Equilibrium would be met by salt rushing into and out of the cell evenly.
O Equilibrium would be met by water rushing into the cell.
Answer:
A. The water rushes out of the cell