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| Q. |
The amount of oxygen in the atmosphere remains relatively constant because it is given off by - |
| A. | Oceans |
| B. | Animals |
| C. | Rocks |
| D. | Plants |
| Answer» D. Plants | |
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Explanation: Just as water moves from the sky to the earth and back in the hydrologic cycle, oxygen is also cycled through the environment. Plants mark the beginning of the oxygen cycle. They use the energy of sunlight to convert carbon dioxide and water into carbohydrates and oxygen in a process called photosynthesis. |
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