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Image of a colony of purple tube sponges on a coral reef
© Copyright Aris Multimedia Entertainment, Inc., 1993
  Image 1-14
Purple Tube Sponges

This colony of tube sponges resembles the pipes of a musical instrument. These sponges are actually animals, although they are the simplest animals on Earth. Sponges are frequently used as shelter for small crabs, shrimps, and other invertebrates.

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