Good question. Not many people know the answer to that one, but I believe the current theory is that oxygen levels were higher. Nobody knows for sure, though.
Why dinosaurs were so big is because in prehistoric times there was no winter. and dinosaurs are lizards and lizards never stop growing. so mixed with humidity and surplus of food the dinosaurs or lizards lived for hundreds of years and grow all that time.
California was under the ocean during the Mesozoic, so dinosaurs did not live here. Notable animals from the Mesozoic in California include Shastasaurus, an icthyosaur with one species that grew up to 69 feet long.
I think so because animals are descendants of dinosaurs and who knows.maybe one day they'll turn to dinosaurs again
They live here so so they won't have to get attacked by all the other big animals
they are a great part of history cause they are a fine example of evolution
Not all dinosaurs had large feet. Some dinosaurs were small and didn't have big feet.
There was much more food back then, so they ate more and grew.Not all dinosaurs were huge. Many were quite small. It is believed that during the Mesozoic, earth was at its highest point of life sustaining ability. The high oxygen levels allowed truly massive animals to evolve.
we dont even know that were there any dinosaurs because in our holy book Quran ........it has nothing about dinosaurs . so dinosaurs came just after a few animals on earth .
Mammals and dinosaurs started about the same time and mammals are still here, so ... Mammals! (Unless you count birds as dinosaurs, in which case it's a tie). One of the mysteries of evolution is why the dinosaurs came to dominate the mammals in the first place.
racoons are very commun, so are dinosaurs, especially t-rex
No, when dinosaurs were around, the only mammals at all were little tiny animals that looked like shrews.
They are big so they can produce enough heat for there bodies.