Given the question: Answer the following question given this paragraph: Evolution occurs in a population when its allele frequencies change over time. For example, the frequency of the A allele might change from 0.7 to 0.8. If that happens, evolution has occurred. What causes allele frequencies to change? The answer is forces of evolution. Q: What occurs in a population when its allele frequencies change over time? Choices: - variation - generation - extinction - evolution A:
The answer is:
evolution