How might a mutation benefit the cell that inherits the mutation? A.
If the mutation reduced the gene product's activity.
B.
If the mutation inactivated a gene that was harmful.
C.
If the mutation had no effect on the activity of the gene product.
D.
It could not be; all naturally occurring mutations are destructive.

a- all cells come from pre-existing cells

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the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.