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

Fact 2: Natural selection only selects functionally advantageous systems.

Given the two facts above, answer the question "What is usually chosen in evolution?" with the following options: 
- common traits
 - Plant reproduction
 - advantageous systems
 - undesirable traits
 - Animal survival
 - competition
 - mysterious sytems
 - Earth revolving around the sun


 

   advantageous systems      