I'd use the library, the encyclopedia and the Internet.
Answer:
C.) The oxygen produced by photosynthesis during the day is greater than the amount of oxygen used for respiration.
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.
Answer: Populations of both predators and competitors would increase. Populations of predators would increase, and those of competitors would decrease. Space increased, competition decreased, and bison and elk populations increased.
Explanation: Hope this helped :D