Which of the following diagrams represents the correct cycling of gases?

Third diagram represents the correct cycling of gases.

Third diagram indicates the right cycling of gases because the diagram shows that respiration releases carbondioxide gas whereas photosynthesis releases oxygen gas. In the cellular respiration, glucose is broken down produces energy in the form of ATP, water and carbondioxide.

While on the other hand, in the process of photosynthesis, carbondioxide reacts with water in the presence of light produces glucose and oxygen so we can conclude that third diagram represents the correct cycling of gases.

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The third diagram shows the correct cycling of gases.

Photosynthesis and respiration are two important processes in nature because each makes use of the product from the other. In photosynthesis carbon dioxide is taken in by plants and combined with water to form glucose.

Respiration occurs in animals. In the process of respiration, animals taken in oxygen and uses it in the breakdown of glucose to release energy in body cells.

We can see that the carbon dioxide released in respiration is taken in during photosynthesis and the process of photosynthesis produces oxygen which is taken in for respiration and the cycle continues.

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correct answer is a. and d.