Fact 1: Most invertebrates have a nervous system.

Fact 2: An octopus is a very intelligent invertebrate.

Given the two facts above, answer the question "what has a nervous system?" with the following options: 
- h2o
 - tortoises
 - viruses
 - bacteria
 - crocodiles
 - octopus
 - animals
 - elephants


 

      octopus   