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Seaweeds are algae, and need light for photosynthesis the same as other plants. Seaweeds come in three colours, brown, red, and green. The non-green ones use chemicals different from chlorophyll for their photosynthesis.

Necessarily their need for light makes them shallow water plants.

There are seaweeds that are entirely free-floating - these commonly have air-filled bladders to aid flotation. The Sargassum are notable for this.

Seaweed is a general term, not a technical one.

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