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When animals and people
breathe, they give off carbon dioxide into the air
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During Photosynthesis,
plants and trees give off oxygen into the air.
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Leaves and needles take
in carbondioxide from the air.
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Humans and animals use
the oxygen in the air in order to breathe.
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Trees use carbon dioxide+water+energy
from the sun to make simple sugars which are "food" for the tree. This
process is called photosynthesis.
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