Fact 1: Most invertebrates have a nervous system.

Fact 2: Jellyfish and insects are invertebrates.

Given the two facts above, answer the question "What have a nervous system?" with the following options: 
- fur seals
 - viruses
 - animals
 - jellyfish
 - bacteria
 - ducks
 - mammals
 - phytoplankton


 

    jellyfish     