First animal on Earth: Did the sea sponge prompt an explosion in early life?

The Humblest of Sea Creatures Helped Life Rise on Earth

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.