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

Fact 2: Water, carbon dioxide, and nitrogen are all needed by living things.

Given the two facts above, answer the question "What is needed by living things?" with the following options: 
- hate
 - sunlight
 - Chemical energy
 - pain
 - love
 - hydration
 - The atmosphere
 - Energy.


 

       The atmosphere  