Q: Which theory explains how populations of organisms can change over time?


Read this paragraph and choose the correct option from the provided answers:

The theory of evolution by natural selection explains how populations of organisms can change over time. As environments change, so must the traits of organisms if they are to survive in the new conditions. Evolution by natural selection explains how this happens. It also explains why there are so many different species of organisms on Earth today. You can see examples of the incredible diversity of living animals in Figure below . You can read more about the theory of evolution in the chapter Evolution.

 Choices:

- free by natural selection

- changes by natural selection

- intelligent selection

- evolution by natural selection


A:
evolution by natural selection