Hank likes to explore nearby streams during the summer. However, one winter there is a lot of rain near the stream.

How might the stream change before the next summer?
A.
The stream will have dried up.
B.
The stream water will be shallower.
C.
The stream will be in a deep canyon.
D.
The stream banks will be steeper.

d

Explanation:

becouse you aready have to know its not a  or b  and i used to go to a creek and it rainde alot and the banks got steeper

genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: