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Sponges do not have a mouth, a neural system or even any sensing organs. Still they have a variety of specialized cells, performing different tasks like pumping water, extracting and digesting particles from the water. A sponge may filter 10.000 - 20.000 times its own volume every day. Tiny hairs shimmer continuously to pump water through its internals. Sponges are responsible for the very important task of dissolving solid calcium and thereby enable mussels and others to reuse it to build their shells.

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14y ago
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6y ago

Jellies have one bodily orifice and they use it for everything.

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Q: Does the jellyfish have a mouth?
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