1. Ancient History
1. 60 million years ago, the age of giant reptiles came to an end. Dinosaurs ruled the earth, while mammals were not able to evolve because they could never challenge the dinosaurs. Then, a comet hit the earth and the dinosaurs disappeared. Mammals, including primates, were then able to evolve. Over 5 million years ago, primates walked on all fours. ...
- Word Count: 4738
- Approx Pages: 19
- Grade Level: High School