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

Fact 2: Without enough oxygen cell respiration is reduced, leaving a person tired and lacking in energy.

Given the two facts above, answer the question "A person is what without cellular respiration?" with the following options: 
- major threat to health
 - dormant state
 - They may not survive.
 - breathing deeply
 - tired and lacking energy
 - hydrated and full
 - dead organisms
 - awake and sleepless


 

     tired and lacking energy    