What are the answer choices?
a. vitamins.
b. everyday.
I'm not 100% sure on b. but a. has to be vitamins.
The nucleus is the right answer BOOOF
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The units of evolution are populations and not individuals because a variation or a mutation in an individual is not sure to last or produce offsprings having the same variation or mutation. The proof that a species has truly evolved is when the variation has allowed the species to survive its environment and produce generations carrying the same variation.