Answer:
c. their shape, which relates to the lock-and-key model
Explanation:
The primary source of the specificity of enzymes is their shape, which relates to the lock-and-key model
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Should be A. Species have changed over time.
Atoms, molecules, cell membranes, then cell (in order from smallest to biggest).
The answer is "because water is produced as a by-product"...the word dehydration should also be a major clue because that means water loss.
I believe it is either B or A, personally i'm leaning towards B, but at the same time, i don't think that we would be obtaining materials via pollination, so it then causes A to make more sense.