Humans and change.

Main

150 mya

150

fossil evidence suggests reptiles regulate tempatures.

500 mya

500

green alge living in sun lit shadows.

1,500 mya

1,500

single cell ancestors reproduce.

40 mya

40

the cow family starts to appear on earth.

50 mya

50

grasses start to grow on earths surface.

65 mya

65

meteorite hit earth

3 mya

3

"lucy" first human like creature.

2,500 mya

2,500

organisms modify the chemical and physical nature of the biosphere

3,500 mya

3,500

cyno bacteria produce food.

4,600 mya

4,600

4,600 mya bacteria is on earth