You are presented with the question "what has a nervous system?" and the following answer choices: 
- h2o
 - tortoises
 - viruses
 - bacteria
 - crocodiles
 - octopus
 - animals
 - elephants

Now knowing that most invertebrates have a nervous system and an octopus is a very intelligent invertebrate, choose the best answer.


 

      octopus   