Anna often finds that she becomes drowsy in the afternoons. The warmer her classroom is, the harder she finds it to stay awake. Why does warmth make her more tired?
A.
The environment is so hot that it interferes with the normal chemical reactions of cellular respiration.
B.
The heat signals the cells in her body to stop cellular respiration in order to conserve oxygen.
C.
Her body produces less energy in order to keep her from overheating.
D.
Most of her body's energy is being used to reduce her temperature through sweating, panting, and similar methods.
