Given a population that contains genetic variation, what is the correct sequence of the following events under the influence of natural selection? 1. Well-adapted individuals leave more offspring than do poorly adapted individuals. 2. A change occurs in the environment. 3. Genetic frequencies within the population change. 4. Poorly adapted individuals have decreased survivorship. a. 2 → 4 → 1 → 3 b. 4 → 2 → 1 → 3 c. 4 → 2 → 3 → 1 d. 2 → 4 → 3 → 1