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-Sponges are super simple! They're like a bunch of cells hanging out together.

-They don't have a head, or legs, or any of that stuff.

-Their bodies are full of holes and channels so water can flow through them

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-Sponges have lots of different types of cells, but they aren't organized into fancy tissues or organs like in other animals

-Some cells have tiny hairs called flagella that help move the water

-Other cells grab the food from the water

-And some cells make tiny needles called spicules

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-Sometimes a little piece of a sponge can break off and grow into a whole new sponge

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-Some sponges live for just a few months. But some big sponges can live for hundreds of years

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There are lots and lots of different kinds of sponges. Scientists think there are about 5,000 to 10,000 different species

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-Sponges are filter feeders. They suck water into their bodies through the holes. Then special cells grab tiny bits of food from the water

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-Sponges are one of the oldest groups of animals on earth. Some sponges are super tiny, and some are big enough to take a bath in. Sponges can regenerate! If you cut a sponge into pieces, each piece can sometimes grow into a new sponge