Fact 1: Most invertebrates have a nervous system.

Fact 2: Insects are the most common invertebrates.

Given the two facts above, answer the question "what do most types of have nervous systems?" with the following options: 
- complex
 - animals
 - cows
 - insects
 - goats
 - protist
 - bacteria
 - sweat glands


 

    insects     