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valkas [14]
3 years ago
11

What are the nitrogenous bases found in dna?

Biology
1 answer:
REY [17]3 years ago
6 0
<span> Adenine, Guanine, Thymine, and Cytosine :)</span>
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Down's Syndrome is also called Trisomy 21 because affected people have three copies of chromosome 21. How is this possible?
Whitepunk [10]

Answer:

hope this helps

Explanation:

About 95 percent of the time, Down syndrome is caused by trisomy 21 — the person has three copies of chromosome 21, instead of the usual two copies, in all cells. This is caused by abnormal cell division during the development of the sperm cell or the egg cell.

7 0
3 years ago
Which statement about bones is
SSSSS [86.1K]

Answer:

The correct answer is:

C. Blood vessels run around bones and not through.

4 0
3 years ago
Teeth are part of the digestive system.<br><br> [True]<br> Or<br> [False]
Lostsunrise [7]
False teeth help the digestive system by chewing pieces of food into smaller pieces but it is not part of it.
<span />
8 0
3 years ago
Please help hurry!
Svet_ta [14]

Answer:

I think the answer is D: Infrographic that shows carbon moving through ecosystems

6 0
2 years ago
Why the horses developed an oxygen debt when they exercised.
user100 [1]

Answer:

The horses developed an oxygen debt when they exercise because they suffered from Exercise-Induced Pulmonary Hemorrhage (EIPH).

Explanation:

A temporary shortage of oxygen in the body tissues during physical exertion such as exercise or a sudden burst of activity is referred to as oxygen shortage.

Horses (compared to humans) are uniquely designed to experience little or none of this.

When the body takes up oxygen, it reacts with glucose to produce energy. This is called Aerobic respiration.

There is also another procedure that the body uses to produce energy. This occurs when glucose is broken down in the cells. After this happens, lactic acid is created but cannot be stored in the body and must be expelled.

This interval when energy is produced without the presence of oxygen is called "oxygen debt".

When a horse is fit, its breathing quickly returns to normal. The longer the time taken for the breathing to return to normal, the less fit the horse is.

One of the factors that can reduce the fitness of a horse is the Exercise-Induced Pulmonary Hemorrhage (EIPH).

This occurs when blood vessle in the lung ruptures causing blood to bleed into the airways. So blood occupies space where oxygen should have. This reduced the amount of oxygen delivered to the blood stream. Hence the oxygen debt takes longer to be repaid.

Cheers

6 0
3 years ago
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