Fact 1: Evolution occurs in response to a change in the environment.

Fact 2: Extinction is a natural part or the process of evolution.

Given the two facts above, answer the question "What happens to an environment to cause extinction? " with the following options: 
- relocation
 - changes
 - rain
 - exposure
 - forces
 - wind
 - Pollution
 - discovery


 

  changes       