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Oxygen (O) is responsible for cellular respiration in plants. Plants acquire O by breaking down carbon dioxide (CO2) during photosynthesis and end up releasing the majority of it as an unnecessary byproduct, saving a small portion for future energy.

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All O available to life on Earth comes from plants.

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Most of the O plants take in is expelled as a byproduct. Only a very small amount is actually used by the plant for respiration.

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Plants don't absorb O from the air, but instead acquire it during the breakdown of carbon dioxide (CO2) as part of photosynthesis.

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Oxygen interacts with nitrogen (N) in a process called denitrification, and it affects other elements' oxidation states as well.

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Only the leaves and stems of a plant acquire O through photosynthesis. The roots of a plant are forced to take in O from the environment through air spaces in the soil.