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Conquest of the Waters

Life on Earth Episode 5 of 13

Fish occur in populations of billions and there are over 30,000 species, more than in any other group of backboned animals. The development of the backbone was a crucial advance in evolution -and it probably came from a most unlikely source, a little jelly-like creature called a sea squirt.

Release date:

55 minutes

Last on

Sat 18 Jan 2014 09:10

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