Life on Earth — Season 1, Episode 5: Conquest of the Waters
Documentary • 55 min • 1 season, 13 episodes • ★ 9.1/10
Episode synopsis
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.
About Life on Earth
The story of life, from the first primitive cells to the plants and animals that now live around us.