Why did dinosaurs evolve earlier than humans?

Answer 1

This isn't really a "why" question; but dinosaurs were not here first - for thousands of millions of years the stromatolitedominated life on Earth. In geological terms, the dinosaurs came along fairly recently.

One reason why large mammals (such as ourselves) did not evolve until after the end of the cretacious brought the end of the dinosaurs, is that there were few environmental "niches" - large mammals would have to compete with large dinosaurs. It was only with environmental changes causing the mass extinction at the end of the cretacious that mammals were able to survive where the dinosaurs could not (at least in their existing forms, there's good evidence that modern birds evolved from dinosaurs).

Answer 2

According to scientists, it's all just a matter of chance and coincidence. See, just before the dinosaurs came into power, a group of Mammal-like reptiles were dominant. These were the titans, the largest and most successful animals until the dinosaurs. With their huge height (up to 15 feet) and rather high intelligence, (It's not that hard to compare, the dominant life forms before them were insects) It would have made sense if they evolved into humans like us if they had a hundred million years more.

However, larger forces were at work. This one in particular was a massive surge in volcanic activity that covered Siberia in a lava lake the size of the united states. 90% of all living things died. Small, rodent-like creatures from the mammal-reptile group survived by burrowing underground and becoming actual rodents and the first mammals. The dinosaurs' anscestors were also able to survive, but were much more successful. They quickly became theropod dinosaurs and had the edge in the post-apocalyptic world. The mammal-reptiles that didn't become rodents held on until a mini-mass extinction at the end of the Triassic wiped the last ones out. Now, the mammals were small and insignificant compared to the now dominant dinosaurs. Thanks to the dinosaurs, the mammals- and our anscestors- were kept at bay until 65 million years ago. The mammals' ability to bury underground from the searing heat of the K/T event protected them while the bulky, non-avian dinosaurs died off. Then we could finally rise again and re-take the world. After a while we came along as the first civilized species on the planet.

So, in short, we could come at the same time as the dinosaurs because they got here first and didn't let us evolve until they died.

Answer 3

ABOUT 200-225 million years separated the last dinosaur, and the first human.

Answer 4

because dinosaurs are a simpler life form and are composed of simpler DNA sequences making it easier for the ribosomes to connect and make. just kidding.