Fact 1: Mutations are essential for evolution to occur.

Fact 2: Evolution Evolution means change over time.

Given the two facts above, answer the question "What is essential for change over time?" with the following options: 
- Light
 - Chemical energy
 - Essential oil.
 - evaporation
 - Currency.
 - Clocks.
 - colors
 - Mutations.


 

        Mutations. 