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Algae and other submerged plants floud i...

Algae and other submerged plants floud in water during day time and sink at night, because

A

they come up to enjoy some time.

B

they lose weight at night.

C

they become buoyant due to accumulation of `O_2` as a result of photosynthesis.

D

they become light due to food material accumulation.

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