Before Animals, Evolution Waited Eons to Inhale
Monday, July 25, 2016 - 15:31
in Biology & Nature
A couple of times in four billion years, evolution has slowed to a crawl. And an eon or so has passed before more complex life forms, such as simple animals, could arise. Evolution may have been waiting for a decent breath of oxygen, said researcher Chris Reinhard. And that was hard to come by. His […]