Fact 1: Most invertebrates have a more complex nervous system.

Fact 2: Invertebrates Among the invertebrates, the largest number of species are insects.

Given the two facts above, answer the question "Most insects have a what?" with the following options: 
- faulty nervous system
 - layers of fat
 - epidermis and dermis
 - distracted nervous system
 - complex nervous system
 - brain damaged system
 - biological diversity
 - sensory neurons


 

     complex nervous system    