Walking with Monsters

Life before dinosaurs. It started from 2000 billion years ago to 220 million years ago when the first dinosaurs appeared. It took a a very long time to get to the first dinosaur period, the Triassic. But first earth was a  toxic world with no hope of life. But suddenly it changed. a asteroid hit earth and a huge explosion that formed the land, seas and the first life. Life didn't start on land but it started in the oceans.