The Business of Sponges
Chapter 21 - Sponges and Cnidarians

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To absorb some information about the biology of sponges, visit Introduction to Porifera at the University of California Berkeley's Online Paleontology Museum.

Once you've mastered the basics, branch out and discover one of the most unusual sponges--the Carnivorous Sponge—a killer sponge that captures and crushes its prey.