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ANSWER: from plants, plants give of oxygen that we need and we breathe out carbon dioxide(Co2) and that's what plants need
When a plant does phoyosynthesis it lets out oxygen when it is done.

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Where does most of the air huumans breath come from?

They come from plants. It is a cycle. (Carbon Dioxide and Oxygen Cycle) When you breathe out you realse Carbon Dioxide and the plants sucks it in and relase oxygen and that is what we breathe in.


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Yes you do. See we breathe in oxygen and we breathe out carbon dioxide. Plants are the opposite. They breathe in carbon dioxide and breathe out oxygen. We give them carbon dioxide and they give us oxygen!! That's how we breathe!!!!!!!


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On average, humans breathe in about 21% oxygen from the air.


How come there is enough oxygen left over for animals to breathe?

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What do you breathe when you breathe out?

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