Question

What is microevolution

3.
What is the most likely explanation for how speciation occurs?

A)It occurs only by gradual changes.

B)It occurs only by geographic isolation.

C)It occurs only by natural selection.

D)It occurs by more than one method.

Answer 1

Answer: D

Explanation: Speciation is process in which new and distinct species are formed over a course of time.

It occurs by many means:

1) Gradual Changes- every species undergo some molecular changes with inheritance and eventually leads to formation of an all new species.

2) Geographic isolation- with isolation into a different geographic area, the species try to adopt with the geography and ultimately forms different species. Eg. Australian marsupials.