The theory of how plants and animals adapt to their surroundings is explained by using the cactus as an example.
University of California Extension Ctr. for Media & Independent Learning, 2000 Center St., 4th Fl., Berkeley, CA 94704, Phone: (510)642-0460, Fax: (510)643-9271, Email: email@example.com
Available on VHS
Running time 28 minutes.
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