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oxygen is 21% of the air.

Nearly all living things depend on oxygen. In mammals it is found in the lungs and in the bloodstream.

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Q: Where is oxygen fond in living things and in what amount is it present?
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What do you think will happen to the amount of oxygen present in bodies of water if they get pollutted?

The amount of oxygen is getting low so that the many living things in the water cannot get a normal amount of oxygen that can cause a fish kill.


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Plants give living things oxygen to live.


What factor is the most important to living things?

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