Fact 1: Amphibians have sense organs to smell and taste chemicals.

Fact 2: Smell and taste belong to our chemical sensing system.

Given the two facts above, answer the question "Amphibians have what sort of sensing system?" with the following options: 
- strong
 - retina
 - four limbs
 - chemical
 - mechanical
 - the eyes
 - nerves
 - heat or cold


 

    chemical     