Fact 1: Sweat is used for adjusting to hot temperatures by some animals.

Fact 2: Adjusts controls to regulate temperature and humidity of animals' quarters.

Given the two facts above, answer the question "What is used to adjust controls to regulate temperature?" with the following options: 
- glass
 - motors
 - neurons
 - power
 - copper
 - sweat
 - forces
 - keratin


 

      sweat   