Which of the following best describes the initial separation event in allopatric separation? A. Geographic isolation
B. Isolated niche population
C. Partially isolated population
D. Genetic polymorphism​

A. Geographic isolation

Explanation:

Allopatric speciation occurs when one population separates into two geographically isolated populations. The geographic isolation prevents gene transfer and reproduction, allowing for genetic divergence between the two populations.

The  Answer is A

Explanation:

hope it helps

      n

unicellular organisms, like bacteria, are able to perform all life functions within one single cell. multicellular organisms need many different types of cells to carry out the same life processes. each of these special types of cells has a different structure that it perform a specific function.