Some sugar molecules are absorbed from the small intestine into the blood by active transport. Explain why the rate of absorption of these can depend on the concentration of oxygen in the cells lining the small intestine?

Because oxygen is the mediator of active transport.

Explanation:

The greater the oxygen, the greater the active transport, since it requires ATP and this energy currency requires cellular respiration.

the correct answer is option b

behavioral response need communication and thus co-ordination at several levels such as interaction among cells, organ system and the entire organism.

behavioral response produces both internal and environmental stimulus.