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Changing Seas
Sponges: Oldest Creatures in the Sea?
Season 8
Episode 801
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.
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26:44
Researchers provide data necessary to protect fish populations from further decline.
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26:42
Researchers study what impact ecotourism might have on southern stingrays.
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26:43
Researchers are beginning to understand where turtles go during their “lost years.”
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27:02
Scientists spend a month in the Galapagos Islands to conduct research.
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26:54
The world’s largest known aggregation of whale sharks occurs just off the coast of Cancun.
