Fact 1: Cellular respiration is when a cell converts from oxygen and carbohydrates into carbon dioxide, water, and energy.

Fact 2: Cellular respiration is a requirement for life.

Given the two facts above, answer the question "what is cells converting oxygen and carbohydrates into carbon dioxide, water, and energy?" with the following options: 
- not necessary for life
 - requirement for life
 - Most plants
 - one celled organisms
 - digestion
 - they body they live in
 - h2o
 - circulatory systems


 

  requirement for life       