ASAP this helps me get my credit.

1) D

2) B

3) B

4) C(?), B(?), A

5) D

6) A

7) D(?)

8) I can't read the question

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).