You are presented with the question "Which of the following do humans not use to communicate?" and the following answer choices: 
- chemicals.
 - limb amputation
 - emissions
 - sweating
 - smoking pipes
 - dry conditions
 - visible energy
 - heat or cold

Now knowing that animals can communicate with sounds, chemicals, or visual cues and unlike animal communication, properly human communication is abstract and linguistic in nature, choose the best answer.


 

 chemicals.        