Answer the following question: 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, what is used to adjust controls to regulate temperature?

Select from: i. glass. ii. motors. iii. neurons. iv. power. v. copper. vi. sweat. vii. forces. viii. keratin.
Answer:
vi.