Oxygen is a gas produced by ........ and used by ..........

Plants, animals

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Animals, plants

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Photosynthesis, carbon dioxide

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Carbon dioxide, photosynthesis

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Solution

The correct option is A Plants, animals
Photosynthesis produces oxygen as waste. Plants and algae breathe out this oxygen into the atmosphere. We, humans and animals then breathe in this oxygen ( $O_{2}$ ) for cellular respiration to release the energy from glucose. Oxygen is needed for cellular respiration, but it does not come from this process.

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