Question

Which of the following is a likely explanation for the change in oxygen concentration in response to the time of day?

A.) Most organisms increase the rate of respiration at night.

B.) Organisms are performing photosynthesis during the day and cellular respiration at night.

C.) The oxygen produced by photosynthesis during the day is greater than the amount of oxygen used for respiration.

Answer 1

C.) The oxygen produced by photosynthesis during the day is greater than the amount of oxygen used for respiration.

Step-by-step explanation:

Oxygen concentration decreases at night.Concentrations of oxygen can decrease significantly during the night, due to respiration. DO concentrations are usually highest in the late afternoon, because photosynthesis has been occurring all day.