Geological/ Biologic Time line

During the presentations I learned a couple new things about ancient life and they way earth use to work.

Earth was a very different back then it had very different levels of chemicals in the atmosphere, such as in the begging there was little oxygen but high levels of methane in the air, there were also a very strange array of ancient life back then such as mutli eyed creatures and armored fish. There were also many strange sporatic extictions that wiped out most life on the planet. All in all earth was a very different place.