Question : The amount of oxygen in the atmosphere remains relatively constant because it is given off by
Option 1: oceans
Option 2: animals
Option 3: rocks
Option 4: plants
Correct Answer: plants
Solution : The correct option is plants .
Oxygen is cycled through the environment in a similar way to how water moves from the sky to the earth and back in the water cycle. Beginning with plants, the oxygen cycle begins. Through a process known as photosynthesis, they transform carbon dioxide and water into carbohydrates and oxygen. To put it another way, plants "breathe" in carbon dioxide and "breathe out" oxygen.
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