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mestny [16]
3 years ago
7

Which of the following statements is true? All mutations cause evolution. Any change to the DNA of an organism is called evoluti

on. All mutations are harmful. Evolution happens slowly over time.
Biology
2 answers:
AnnyKZ [126]3 years ago
4 0
Evolution happens slowly over time is the true statement
stellarik [79]3 years ago
4 0

evolution happens slowly, cause thats never quick lol

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Which era spans the least amount of time on the<br> geologic scale?
Ludmilka [50]

Answer:

Trilobites

Explanation:

3 0
3 years ago
Why is it so important for animals to keep the concentration of their body fluids constant​
Maurinko [17]

Answer:

A balance of bodily fluids will prevent the development of diseases, the deterioration of body organs, and death of animals.

Explanation:

Water, blood, saliva, sweat and other body fluids should be kept constant and balanced through homeostasis because the sharp rise and fall of these fluids will prevent the organs of the body from operating optimally and this can lead to the development of diseases and consequent death. For example, water is a vital fluid. Too much of water in the system can lead to diseases like Edema where the legs begins to swell because there is no way of letting out body fluids from the body.

Too little water in the body can lead to dehydration and the increase in blood pressure because of the excessive concentration of solutes. The digestive and urinary systems have  mechanisms to keep this fluid under control.

6 0
3 years ago
If a DNA molecule is found to be composed of 40% thymine, what percentage of guanine would be expected.
Likurg_2 [28]

Answer:

10%

Explanation:

Chargaff postulated the complementary base pairing rule, where he stated that in the DNA molecule, Adenine (A) will always pair with Thymine (T) and Guanine (G) with Cytosine (C) i.e. A-T, G-C

Chargaff stated that the concentration of purines (Adenine and Guanine) is always equal to that of pyrimidines (Thymine and Cytosine) i.e. {A} + {G} = {C} + {T}

These equal concentration equals 100% in totality i.e. A+G+C+T= 100%

Thymine pairs with Adenine, if there is 40% of Thymine in the DNA molecule, it means there will be 40% of Adenine also. 40 + 40 = 80%. This leaves us with 100-80 = 20% for Guanine and Cytosine.

Since there will be an equal amount of Guanine and Cytosine too, Guanine will therefore, be 20/2 = 10%.

That is, 10% Guanine, 10% Cytosine.

8 0
3 years ago
The children in a family all have blue eyes. the biological parents also have blue eyes. the science that explains these similar
Anika [276]
The answer would be True
4 0
3 years ago
In the absence of oxygen, what is the net gain of ATP for each glucose molecule that enters glycolysis?
Naily [24]

Answer:

2 molecules of ATP

Explanation:

Glycolysis is the anaerobic process (no oxygen required) used in the breakdown of glucose to extract energy. It occurs in the cytoplasm of both prokaryotic and eukaryotic cells. It is the first step of cellular respiration.

Glycolysis is subdivided into two phases: the first phase uses energy (ATP), while the second phase produces it together with pyruvate and NADH.

Two molecules of ATP are required for the first stage of glycolysis, while 4 ATP molecules and 2 NADH molecules are formed in the second stage.

5 0
3 years ago
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