Fact 1: Evolution is a change in the characteristics of living things over time.

Fact 2: Characteristics include traits like shape, color, size, and texture.

Given the two facts above, answer the question "in evolution, what changes in living things over time?" with the following options: 
- traits
 - gravity
 - oxygen
 - mammals
 - h2o
 - alleles
 - animals
 - insects


 

 traits        