Fact 1: An animal requires air for survival.

Fact 2: Air is primarily oxygen and nitrogen.

Given the two facts above, answer the question "What does an animal require for survival?" with the following options: 
- layer of body fat under skin
 - A compound that donates proton
 - Molecular kinetic energy
 - mineral particles and organics
 - a complete digestive system
 - converting food to energy
 - keeping food fresh for long periods of time
 - Something made primarily of oxygen and nitrogen


 

        Something made primarily of oxygen and nitrogen 