You are presented with the question "Most invertebrates are what?" and the following answer choices: 
- microorganisms
 - extinct creatures
 - remains of prehistoric life
 - more abundant
 - dying species
 - complex living creatures
 - members of their own species
 - ruined creatures

Now knowing that most invertebrates have a more complex nervous system and all complex living creatures, are organized by a nervous system , choose the best answer.


 

      complex living creatures   