Biology

The correct answer is: D.the population is undergoing evolution.

Explanation:

When the gene pool of a population changes, it means that the genetic makeup of the population has altered over time, which is a key indicator of evolution. Evolution refers to the change in allele frequencies within a population across generations. Factors such as natural selection, genetic drift, mutations, and gene flow can all contribute to changes in the gene pool.

Here’s why the other options are incorrect:

A.Number of organisms in the population changes: While the population size may change over time, th...