Fact 1: Specialization occurs when competing species evolve different adaptations.

Fact 2: Most species are highly specialized for their environments and evolve as the environments change.

Given the two facts above, answer the question "Specialization occurs when competing creatures evolve as the what?" with the following options: 
- habitats grow
 - salamanders
 - animals develop
 - times change
 - It helps them survive
 - principals of aerodynamics
 - environments change
 - remains of prehistoric life


 

       environments change  