Fact 1: Sweat wets the skin, and when it evaporates, it cools the body. Fact 2: Sweat is water, salt, some urea. Given the two facts above, the thing that cools the body contains what?
Choose your answer from:
- liquid.
- matter.
- vapors.
- oxygen.
- Urea.
- nektar.
- water.
- Air.
Answer:
Urea