Is the sea sponge a plant or animal?

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A sea sponge is an animal that attaches itself to rocks, reefs, and the ocean floor. Since it doesn't have much in the way of body functions — such as a digestive, nervous, or even circulatory system — it survives by filtering water through itself and eating the bacteria and microscopic organisms found there for food; some species even evolve with the water current in order to filter more efficiently!

Did you know?
Did you know that you might have a sea sponge in your very own home? Ask your parent if they keep any in the bathroom or garage — certain varieties found in the Caribbean and Mediterranean have been sold for cleaning and household use for centuries! Of course, the sponge has to be thoroughly cleaned and rid of any living cells before it can make its way to store shelves; what you see is more like a sponge "skeleton."

Due to worries about over-harvesting, synthetic versions are now commonly available as well.