Question

Consider the following scenario:

In an aquatic bird population, some birds have long legs. Other birds have short legs. The food supply is minimal. The birds with long legs are able to wade farther into the water where they can find fish. Over time, the birds with long legs become more common.

What scientific term best describes this scenario?

(1 point)
Responses

selective pressures
selective pressures

natural selection
natural selection

mutation
mutation

fitness

Answer 1

natural selection

Explanation: Long-legged birds survive and reproduce more in the food-limited environment, so alleles for long legs increase in the population over time — a classic case of natural selection.