Answer: To maintain Cellular respiration
Explanation:
The body must take in oxygen so that the blood cells can absorb it. This allows the blood cell to release CO2. Therefore, Inhaling oxygen is necessity for maintaining cellular respiration.
I believe the answer is D) ATP is too unstable
Most digestion of carbohydrates occurs in the small intestine.
B.exercise because static stretch and rest aren't physical which wouldnt move muscles