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Unlike anemones, sea sponges do not have external structures to reach out and physically obtain resources.

Sea sponges have pores which allow water to enter into one or more central cavities. In order to move the water continuously through its pores, tiny flagella known as choanocytes line the inside of the sponge (they are very small, nearly microscopic in most varieties). Any small biological matter is then filtered and digested inside of the sponge. Essentially sea sponges help keep the oceans clean by filtering out tiny particles floating in the surrounding water.

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