This is a sponge. It is one of the most simplistic animals on the earth. The sponge is a member of the phylum Porifera, which all animals in are sessile.
It cannot move from place to place the way most other animals can. A sponge is an animal that grows in one spot like most plants do. Nevertheless, sponges are quite successful.
Sponges are filter feeders, which means that they get their food from the water around them. when they are first born, they "swim" using scillia. once they find a place to settle down, they stay there the rest of their life.
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