Mitochondria and chloroplasts are structures found in the eukaryotic cells.
What is the theory regarding their origins?

(Choice A)
A
They developed as a prokaryotic cell membrane folded in on itself.

(Choice B)
B
They were non-living food particles that were ingested by bacteria.

(Choice C)
C
They developed from prokaryotic cells that were engulfed by the other cells.

(Choice D)
D
They originated from photosynthetic bacteria.

C - They developed from prokaryotic cells that were engulfed by the other cells.

Explanation: Mitochondria and chloroplasts each contain their own DNA, suggesting that their origins stemmed from a prokaryotic organism. Hope this helps. Have a nice day. :)

increases the risk of extinction 

explanation:

the answer is that if the species suffers from the disease, there is nothing stronger than the others, so it is possible to remove wholeness. an example of this is hunger in irish potatoes, which has a deadly disease bearish part of all potato harvest masses. pretty much ruins the land of crops.

which condition is a cause of impotency in men?

b. the inability of the penis to become erect