Animals need O₂ because it ________.
A)plays a role in obtaining energy from food
B)helps animals synthesize proteins
C)is necessary to make CO₂
D)is needed to deliver hemoglobin to the cells of an animal's body

Question

Quizplus · Accepted Answer

Oxygen is essential for the process of cellular respiration, which is how animals convert food into energy. Without oxygen, the process cannot occur, and the animal will be unable to obtain energy to survive.

Animals Need O₂ Because It ________