Changing Seas

Season 8 Episode 1: Sponges: Oldest Creatures in the Sea?

Until recently there was scientific consensus 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. But recent DNA research has cast doubt on that theory, with some scientists suggesting that ctenophores, also known as comb jellies, are an older lineage.

Genre:

Documentary

Seasons:

18

Episodes:

56

Actor:

Craig Sechler

Quality:

HD

Status:

Returning Series

First Air:

2009

IMDb:

-