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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.

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15y ago

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Why where dinosaurs so big?

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.


Where there dinosaurs in California?

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.


Will dinosaurs ever come back alive?

I think so because animals are descendants of dinosaurs and who knows.maybe one day they'll turn to dinosaurs again


Why do emergent layer animals live in the emergent layer?

They live here so so they won't have to get attacked by all the other big animals


Why are dinosaurs so great?

they are a great part of history cause they are a fine example of evolution


Why were woolly mammoths so tall?

Not all dinosaurs had large feet. Some dinosaurs were small and didn't have big feet.


Why were dinosaurs so big?

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.


What year did the dinsours came to earth?

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 .


Who has lived longer on earth so far dinosaurs or mammals?

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.


What are some animals in Florida?

racoons are very commun, so are dinosaurs, especially t-rex


Did man walk the earth with the dinosaurs?

No, when dinosaurs were around, the only mammals at all were little tiny animals that looked like shrews.


Why are tundra animals so big?

They are big so they can produce enough heat for there bodies.