A “Whiff” of Oxygen

A “Whiff” of Oxygen

by | Aug 28, 2021 | Post

A “Whiff” of Oxygen Ready for a whiff of oxygen that’s 2.5 billion years old?   Our Earth wasn’t always the oxygen-rich planet it is today. That didn’t happen until 2.4 billion years ago. That’s the time complex organisms marched onto the scene and evolved...