Sponge
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A sponge is a very simple kind of animal. It lives in the ocean. It has quite a few channels, which grow thinner all the time. It feeds from pumping water through, and lives off what is in that water. It is a filter feeder. Sponges are stationary, they are fixed to some kind of support. The larvae of the sponges can move about, though. The tissue of the sponges has very little structure. There are no organs, no nerves, no muscles and no brain.
There are over 5000 different kinds of sponges currently known. Sponges can be found from the tidal zone to the abysmal zone, to a depth of about 8,500 meters.
People have used sponges (collected and dried) for a long time. They usually wash with a sponge.
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