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

Day
Time
Channel
9/9/2017
1 p.m.
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