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Leaves contain chloroplasts; which make sugars using sunlight. This is called photosynthesis. One of the by-products of this process is Oxygen. This oxygen sits in the Parenchyma, which is in the middle of the leaf. This gives the leaf a lower density than water; so it floats on the surface. This oxygen, if it is not used by the plant, is later released from the Stoma, which are little holes on the bottom of the leaf; and the leaf sinks.

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13y ago

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