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Afina-wow [57]
3 years ago
11

Down's Syndrome is also called Trisomy 21 because affected people have three copies of chromosome 21. How is this possible?

Biology
1 answer:
Whitepunk [10]3 years ago
7 0

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.

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Several groups of protists have variable modes of nutrition: Some species are photoautotrophs, whereas close relatives are heter
Radda [10]

Answer:

The endosymbiotic theory

Explanation:

Protists are the multicellular organisms which possess characteristics of both the prokaryotes and eukaryotes.

The protist can derive nutrition by either heterotrophic mode or photoautotrophic mode. This variation could exist within the same genus and same species.

This variation could be explained with the endosymbiotic origin of the organisms as some species could engulf the photosynthetic bacteria whereas some could have engulfed the chemosynthetic bacteria.

This can be observed in the green and red algae which depend on a different mode of nutrition belonging to the same group.

Thus, the endosymbiotic theory is correct.

4 0
3 years ago
The left ventricular wall of the heart is thicker than the right wall in order to ________. A. pump blood through a smaller valv
kolezko [41]

Answer:

The correct option is: C. pump blood with greater pressure

Explanation:

The human heart is a muscular organ, present between the middle compartment of the chest and the lungs. Heart is responsible for pumping blood through blood vessels of the circulatory system. It is divided in the following four chambers: the right atria, left atria, right ventricle and left ventricle.

The wall of the left ventricle is thicker as compared to the wall of the right ventricle. This is because <u>greater force is required to pump the blood to the entire body.</u>

3 0
3 years ago
Why is systems theory important in a workplace?​
Aneli [31]
To help work place with the system
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Pani-rosa [81]
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Naddik [55]

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6 0
4 years ago
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