Changing Seas

Sponges: Oldest Creatures In The Sea?

Season 8, Episode 1 of 4

Shows how recent DNA research has cast doubt on the theory that sponges were the first animals to branch off the "Animal Tree of Life, " a kind of family tree for all living and extinct animals on earth. Recently, some scientists are suggesting that ctenophores, also known as comb jellies, are an older lineage.

Previously Aired

1 p.m.
7:30 a.m.
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