Fact 1: Most invertebrates have a nervous system.

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

Given the two facts above, answer the question "what do insects have?" with the following options: 
- four limbs
 - liver
 - sensory neurons
 - epidermis and dermis
 - lizards
 - spiders
 - important habitats
 - nervous system


 

        nervous system 