Life on Earth
Season 1 • Episode 5: Conquest of the Waters • Watch with subtitles
Episode 5: Conquest of the Waters
February 13, 1979 • 55 min
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.
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