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3 years ago

Why do scientists use control groups in experiments?

2 answers:

3 0

A reasearcher must only measure one variable at atime,and using a scientific control group gives reliable baseline data to compare their results with.

laila [671]3 years ago

3 0

<span>Scientists use control groups in experiments to have more reliable data and to minimize the errors in the experiments. Usually, scientists study about an effect of different factors one at a time so it is important to have control to avoid other factors that may affect the set-up.</span>

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noah created a model of a glacier to help explain how glaciers change the surface of Earth. He froze two large blocks of ice. On

erastova [34]

Answer: The model is depicting the glacier erosion.

Explanation:

The glaciers are responsible for causing erosion of the earth. They transport the materials away from the locations were they are earlier situated. They carve the materials present beneath the land. They erode the materials like soil, pebbles, boulders, against the pressure of the unstable mass of the ice moving down the slope. The broken ice mass carriers away the broken rocks, materials and soil debris far away from the places where they have been originally situated. This causes the glacial erosion. Also the broken and displaced rocks displace the soil and other materials come in contact with during erosion.

According to the given situation, the ice formed with water only had no impact on the tinfoil on the other hand the ice containing the sand and rocks removed the tinfoil from places. This is because of the friction created by the sand and rocks on the tinfoil. The glacier material like ice, soil, rocks due to friction erode the material come in contact with it with an appreciable pressure underneath.

3 0

3 years ago

Double-strand breaks cause genomic instability and are thus potentially lethal to cells. They also greatly increase the risk of

rodikova [14]

Answer:

<h2> DNA double-strand breaks are repaired by two main pathways( routes): </h2><h2>i) Non-homologous end joining and </h2><h2>ii) homologous recombination .</h2>

Explanation:

All organisms suffer by double-strand breaks (DSBs) in their DNA.

DSBs caused by exposure to exogenous agents such as radiations, also by certain chemicals, and through endogenous processes, including DNA replication and repair.

Double-strand break repair:

The processing and repair of DSBs can lead to mutations, they can also lead to loss of heterozygosity, and chromosome rearrangements that can result into cell death or cancer.

DNA double-strand breaks are repaired by two main pathways( routes):

i) Non-homologous end joining and

ii) homologous recombination .

Homologous recombination- it takes place by means of replication, using the homologous strand as template. Homologous recombination therefore requires extensive regions of DNA homology in another DNA duplex, and there is no loss of genetic information normally.

Non-homologous end joining- It requires no homology with a second DNA duplex and no, or only a few base pairs of, homology between the two broken DNA ends.

Homologous recombination is the mainly preferred mechanism in yeast.

Non-homologous DNA end joining is more commonly mutagenic than homologous recombination repair.

6 0

4 years ago

Read 2 more answers

Unlike red blood cells, white blood cells

marshall27 [118]

Unlike red blood cells, white blood cells can live for many years.

7 0

4 years ago

Where is the air pressure lower around an airplane wing?<br> 1. under<br> 2. above

valina [46]

Answer:

Above

Explanation:

If you are to look at a diagram, it is clear.

7 0

3 years ago

What must be true for natural selection to happen?

Mila [183]

Answer: Four conditions are needed for natural selection to occur: reproduction, heredity, variation in fitness or organisms, variation in individual characters among members of the population. If they are met, natural selection automatically results.

Explanation:

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3 years ago