Compare & Contrast: Egypt & China. Ancient Egypt and ancient China had many cultural differences and similarities. While Chinaâs form of government is monarchy, Egyptâs is theocracy. As for their religious beliefs, even though theyâre both polytheistic, they have different Gods. Another difference in the two civilizations is the environment.
Palaeontologists have found what is likely to be the oldest known dinosaur, filling in a yawning evolutionary gap. A study in Biology Letters describes Nyasasaurus parringtoni, a new species from 10-15 million years before the previous earliest dinosaur specimens.
Best Answer: According to a PBS website, about 165 million years (From about 230 million years ago to about 65 million years ago ... for a duration of 165 million years.) Dinosaurs existed between 230 million years ago and 65 million years ago, but none of the known dinosaur species existed for this entire time period.