Sponges

Sponges are the simplest invertebrates. They live in water. They filter food from the water that surrounds them.

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media type="file" key="Filtering Barrel and Chimney Sponges.mp4" A snippet from the Cayman's video that demonstrates (using a harmless ink) how sponges filter water. (Video from youtube-http://www.youtube.com/watch?v=T7E1rq7zHLc&feature=related)