The answer is scrotal elevation. Hope this helps please help me by saying this is the brainiest.
Answer:
C
Explanation:
Without crossing over, each chromosome would be either maternal or paternal, greatly reducing the number of possible genetic combinations, which would greatly reduce the amount of genetic variation between related individuals and within a species.
This would be A... Hunting and habitat alteration are both things that contribute largely to animal extinction.
Food and water supply,habitat space, and competition with other species