The Origins Podcast with Lawrence Krauss cover image

Andy Knoll: The First Four Billion Years of Life on Earth

The Origins Podcast with Lawrence Krauss

00:00

Is It True That in the Current World, There's 30 Tons of Bacteria for Every Animal?

Oxygen reached its current levels about six or seven million years ago. And together, those two things provide a new world in which large heterotrophes like animals can and it's sort of a feedback cause,. More food, more algy, more oxygen, and it goes and it continues that way. Ornyo: "I always tell my students that we are guests in a microbal world"

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