Fact 1: Evolution occurs by a process called natural selection.

Fact 2: Speciation is an extension of evolution.

Given the two facts above, answer the question "What occurs by a process called natural selection?" with the following options: 
- competition
 - root growth
 - mitosis
 - meiosis
 - speciation
 - cellular respiration
 - Plants growth
 - Animal survival


 

     speciation    