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Why does a plant need oxygen?
Answer 1:

Plants need oxygen because just like any other living organism, they undergo cellular respiration to break their "food" down.


Answer 2:

Plants need oxygen in order to burn sugar to get energy, just like an animal. Plants can make their own energy from the sun when the sun is up, but if the sun is not up, the plant has to rely on respiration.


Answer 3:

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