A) Crossing over is the mechanism of genetic variation that results from the exchange of gene segments between non-sister chomatids.
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When plants do not get enough nitrogen, they are unable to produce amino acids (substances that contain nitrogen and hydrogen and make up many of living cells, muscles and tissue). Without amino acids, plants cannot make the special proteins that the plant cells need to grow.
PLEASE GIVE ME AS BRAINLIEST
Answer:
Carbon remains carbon
Explanation:
An atom of one element does not change into an atom of another element.
That's why A, B, and D are wrong.