In the oxygen–carbon dioxide cycle, a. animals produce oxygen used by plants for photosynthesis. b. animals produce oxygen used by plants for respiration. c. animals produce carbon dioxide used by plants for photosynthesis. d. animals produce carbon dioxide used by plants for respiration. select the best answer from the choices provided a b c d

The correct answer is option c. "animals produce carbon dioxide used by plants for photosynthesis".

Explanation:

The oxygen–carbon dioxide cycle is an equilibrium in nature where animals and plants depend of each other to obtain the gases needed for respiration and photosynthesis. In this cycle, the animals produce carbon dioxide used by plants for photosynthesis and the plants produce the oxygen used by animals for respiration. This cycle is very important for maintaining environmental living conditions for both organisms, as respiration and photosynthesis are vital processes.

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