This program from the "Life on Earth" series explains that jellyfish, mollusks and horseshoe crabs are among the three types of marine invertebrates whose ancestry began six hundred million years ago.
Home Vision Cinema, c/o Image Entertainment, 20525 Nordhoff St., Ste. 200, Chatsworth, CA 91311, URL: http://www.homevision.com
Available on VHS
Running time 58 minutes.
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