Fact 1: Carbon cycles quickly between organisms and the atmosphere.

Fact 2: Carbon is an essential component of all living organisms.

Given the two facts above, answer the question "What is essential to all living organisms?" with the following options: 
- garbage
 - Energy.
 - hydration
 - gifts
 - food and shelter
 - Chemical energy
 - poison
 - The atmosphere


 

        The atmosphere 