Why do diatoms float on the surface of water?

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(A) Diatoms are photosynthetic protists that store their food reserves in the form of oil droplets (fats) and leucosin (a carbohydrate). These oil dro

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Stored fats

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(A) Diatoms are photosynthetic protists that store their food reserves in the form of oil droplets (fats) and leucosin (a carbohydrate). These oil droplets are lighter than water,which provides buoyancy to the diatoms,allowing them to float on the surface of the water to maximize light absorption for photosynthesis.

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