There is always new information about Earth's oceans being posted on the Web that may be useful as a supplement to our text or as a jumping off point from which to learn more on your own. Here are a few sites to start with:

Anemone and urchin photo
Anemones and urchins at the Monterey Bay Aquarium.
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Last updated 15-May-2007 . Title graphic by Danielle Signor.