Biology

The correct answer is: D.Mutation.

Explanation:

A mutation is a change in the DNA sequence, which can result in the addition of new genes or alterations to existing ones. Mutations are the primary source of genetic variation and can be caused by factors like radiation, chemicals, or errors during DNA replication.

The other options are incorrect for the following reasons:

A.Natural Selection: This is the process where traits that improve survival and reproduction become more common in a population over time, but it doesn't directly cause change...