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

Fact 2: Biological evolution is a change in the genetic characteristics of a population over time.

Given the two facts above, answer the question "What can cause change in genetic characteristics" with the following options: 
- Plants growth
 - Leptospirosis
 - Pesticides
 - environment
 - global warming
 - competition
 - parasites
 - cigarettes


 

    environment     