First animal on Earth: Did the sea sponge prompt an explosion in early life?
The Humblest of Sea Creatures Helped Life Rise on Earth
Slate in motion.
March 19 2014 3:40 PM

Sponge of Life

We may owe our existence to the sea sponge.

Sponges are filter feeders with no sophisticated digestive system, a consumption method that absorbs less oxygen—and may have made the squishy creatures central to early life on Earth. 

Paca Thomas is a regular video contributor to Slate.

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