In order to get energy (ATP) from food molecules in the final stage of respiration, humans require ________.

A) oxygen
B) sodium
C) carbon dioxide
D) ribose

ATP

Adenosine triphosphate, a molecule that stores and transfers energy within cells, enabling various cellular functions.

Oxygen

A chemical element with symbol O, essential for cellular respiration in aerobic organisms and required for most combustion.

Respiration

The metabolic process by which an organism obtains energy by reacting oxygen with glucose to give water, carbon dioxide, and ATP (energy).