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....
It's the spark of imagination. ... Library Search. ... Some people call it "literature search." You might begin your search by calling colleagues who work in the area that concerns you and go from there. ... Since it's an educated guess, I listed it after library search. 5. ...