Tunicates resemble a on the sea floor

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sac

Tunicates are sea squirts that are found in the marine water. These animals remains attached to the rocks and sea beds. They exhibit a body shape which looks like a barrel. The barrel has two openings called siphons. These siphon helps in the intake of the food particles and oxygen. These animals look like a sac on the sea floor.

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it restores trees to areas where they once grew.