I think it is because in the ocean the plankton produces most of the oxygen which is used by aquatic plants and plankton is a primary producer known as autotrops.
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this is question can you ask is this question
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the second one i couldn't find online (about rabbits)
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Wood is made up differently and it has less gravity. Wood also has air holes in it
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When gas molecules are warmed, their average kinetic energy also increases. This means they move faster and have more frequent and harder collisions inside of the balloon.
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