Khan Academy Static

Life began on Earth at least 3.5 billion years ago. Since then, it's diversified in an amazing way! Learn about important events in the history of living organism on Earth, up to and including the appearance of humans.

9747_Human_evolution_overview.html

9744_Ozone_layer_and_eukaryotes_show_up_in_the_Proterozoic_eon.html

9745_First_living_things_on_land_clarification.html

9746_Biodiversity_flourishes_in_Phanerozoic_eon.html