This change in chromosome number is the result of B. Fertilization. Both of the individual gametes from the male and female combine together to produce a zygote or developing offspring that is diploid in most cases, and possess both sets of genetic content or chromosomal information, one from each parent.
Answer:
A. Populations were separated through geographical isolation.
Explanation:
12/20 is the answer I think. I hope this helps you!!
I am sorry I can only answer 7 for you.
Hope it helps
7= By replacing the neurons lost from a injury with new cells.
The statistics of weather how hot or cold it is
