Evolution

the three most important evolutionary changes

The first was

the solar system had been created 5000 millions years ago

The second was

on earth 750 million years ago there was a climate change that caused an ice sheet that covered the entire earth

The three was

190 million years ago the had been broken supercontinent of Pangea , up marking the end of the Paleozoic Era and the beginning of the Mesozoic Era.

The four was

on earth 540 million years ago, the top was changed, plant and animal life was born.