Is sea weed an animal

Sea Otters live in seaweed. They use the seaweed to anchor themselves in one spot when thy sleep so they do not drift away. Also their favorite food lives in the kelp forests, the sea anemone.

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Also sea-horses - they use their tails to hold on to the seaweed. Many other smaller fish shelter among the fronds, and some worms and shell-fish attach themselves or browse on them.