About a billion years ago, Earth started to come into its own. It was past the awkwardness of its younger years full of growing pains and turmoil: comet strikes and slimy water, including the Great Oxidation Event that flipped the world upside down. Roughly a billion years ago, the planet began to a dvance and mature, with plant life developing about 700 million years ago, but still with the occasional wild climate parties to keep things interesting. ...read more read less