B, because in all truth and honesty, stress is truly inevitable. Also, use process of elimination. I hoped that helped :)
Answer:
The populations become adapted to different environments and eventually become so different that they cannot interbreed to produce fertile offspring.
Speciation is the evolution of one species into two different kinds, and when they become isolated, that is the final step, since they cannot interbreed any longer.
It is Nucleic Acids, they consist of long chains of units like the proteins, but still both are different.
The “powerhouses” of the cell, mitochondria are oval-shaped organelles found in most eukaryotic cells. As the site of cellular respiration, mitochondria serve to transform molecules such as glucose into an energy molecule known as ATP (adenosine triphosphate).
Cytokinesis<span> begins in anaphase in animal cells and prophase in plant cells
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