Fact 1: Most invertebrates have a more complex nervous system.

Fact 2: All complex living creatures, are organized by a nervous system .

Given the two facts above, answer the question "Most invertebrates are what?" with the following options: 
- microorganisms
 - extinct creatures
 - remains of prehistoric life
 - more abundant
 - dying species
 - complex living creatures
 - members of their own species
 - ruined creatures


 

      complex living creatures   