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Naturalist David Attenborough examines molluscs, echinoderms, and crustaceans and speculates on the significance of the evolutionary reasons for such extreme diversity. Includes a look at marine in...

Naturalist David Attenborough examines molluscs, echinoderms, and crustaceans and speculates on the significance of the evolutionary reasons for such extreme diversity. Includes a look at marine invertebrates found in the area of Australia's Great Barrier Reef.

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