-
birth of the solar system 5 billion years ago
sun and astriods -
earth began to form 4.6 billion years ago
the earth started -
3.8 billion years ago bacteria diversify
bacteria -
2.2 billion years ago oxygen appears in the enviornment
life on earth -
100,000 years ago modern humans
homo sapiens -
3.7 billions years ago photosynthesizing bacteria
microbes -
3.5 billion years ago oldest fossils
stromatolites -
2.2 billion years ago oxygen appears
health -
1.8 billion years ago oldest eukaryote fossils
acritarchs -
800 million years ago major glaciation period begins
global ice ages -
600 million years ago protective ozone layer in place
ozone layers over planet -
480 million years ago land planets
planets in ocean -
400 million years ago anthropods on land
insects -
350 million years ago reptiles
reptiles roam earth -
250 million years ago end permian
extinct -
220 million years ago dinosaurs
dinosaurs roam earth -
200 million years ago pangaea starts to break apart
heat -
65 million years ago end cretaceous
extinct -
60 million years ago primates
fossils -
5.2 million years ago hominids
humanlike primates -
100,000 years ago late pleistocene
