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.

  Slate Plus
TV Club Podcast
Dec. 1 2015 9:42 AM The Walking Dead Podcast: “Start to Finish” Join our members-only TV Club to listen to a spoiler-filled discussion of Episode 8, the midseason finale of Season 6.