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In the Triassic period, mammals and dinosaurs appear in the rock sequence.

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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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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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:

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:

Answer:

B

Explanation:

3 type of cells that perform different functions

Answer:

every cell type preforms the same function

Explanation:

Answer: 3 Oxygen atoms

Explanation:

The subscript next to "O" is 3. Therefore 3 oxygen atoms. See attached

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

Answer:

Nitrogen cycle

Hope this helps :)

Explanation:

Lots of the nitrogen on earth is underground, in plants and soil.

The carbon dating technique would only be best for a Neanderthal bone from 40,000 years ago.

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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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)

hope this helped !!!!!! :)

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.

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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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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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.

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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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Answer:

I'm pretty sure it is c or a

Forces in earths crust pulling apart the two slabs of rock, this force is called Tension. Therefore, option (A) is correct.

Earth's crust tension pulls rock apart. At divergent plate borders, tectonic plates move apart. Faults form when tensional forces strain and thin rocks when plates separate. These faults can create rift valleys, mid-ocean ridges, and other geologic features.

Seafloor spreading and continental rifting are driven by tension. As plates separate, magma from the mantle rises to build new crust. New crust is formed at mid-ocean ridges. Tensional forces can also cause continental rifting and ocean development. Tension forms Earth's crust and moves tectonic plates. Therefore, option (A) is correct

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The statement " Four factors which need to be balanced properly for a cell in order to be healthy are temperature, chemical content, volume as well as pressure" is 'True'.

The given statement is 'True' as a healthy cell functions best at normal physiological temperature which comes out to be 98.6 Fahrenheit in warm-blooded animals including human beings. Increased temperatures can increase the fluidity of cell membranes which can alter the permeability of the cell. Due to this some harmful substances can enter the cell.

The chemical contents of the cell comprises of four basic organic constituents, i.e. protein, lipid, nucleic acid and carbohydrate. These biomolecules play a crucial role in carrying out various cellular functions. Volume and pressure also need to be balanced properly in a cell to be healthy.

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Explanation:

In stage 1, the enzyme RuBisCO incorporates carbon dioxide into an organic molecule. In stage 2, the organic molecule is reduced. In stage 3, RuBP, the molecule that starts the cycle, is regenerated so that the cycle can continue.

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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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.

Answer:

Smallpox is not around, but it is possible that it can come back through some other way/method.

Explanation:

Hope this helps :)

Answer:

D

Explanation:

chemistry and physics

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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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.

Answer: Soil

Explanation: hope this helps!!

Answer: Unemployed. They were all home relaxing basically retired.

Explanation:

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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C

They describe nature through the past , and future

The answers are 1. True 2. false 3. true 4. true 5. false 6. false 7. true 8. false 9. true 10. false

1. True

For something to be a true organism, it must have at least one cell. Viruses are not covered in this.

2. False

DNA is the same in every cell.

3. True

Recent studies have suggested that all living things have descended from a single ancestor, in the case of Thomas Cavalier-theory, Smith's that ancestor would have been the canao flagellated protists.

4. True

DNA, for instance, is a universal molecule that, even in various organisms, continues to serve the same purpose of "creating" the proteins required for an individual's cells.

5. False

Biodiversity, which is brought about by DNA mutations, environmental pressure, and natural selection, provides an explanation for the variety of life.

6. False

In organic molecules like DNA, information is preserved.

7. True

Additionally, the environment can influence how our cells interpret information. An illustration would be that during our body releases large amounts of the hormone testosterone, which increases our heart rate and blood pressure.

8. False

organisms are open systems rather than closed ones.

9. True

The capacity to keep the internal environment in a state of nearly constant equilibrium despite changes in the external environment is known as true homeostasis. The complex signaling networks that exist between various cells in an organism make it feasible.

10. False

The oneness of biological systems emerges from false evolutionary change.

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