Technically, Earth did not have to "rebuild." However, the surviving organisms quickly repopulated the Earth and filled the niches left empty by the catastrophe.
The dinosaurs went extinct because a comet hit the earth, then it got cold, then it flooded.
No, Dinosaurs became extinct long before humans walked the earth, so it's just not possible for a person to have been bitten by one.
Dinosaurs: Most got extinct in the mass extinction event, about 65 million years ago. Today's birds and reptiles are generally believed to be the descendants of the dinosaurs.Pigs: They walk on earth today.
Dinosaurs are believed to have gone extinct approx. 66 million years ago
An meteor came to the earth and extincted all of the dinosaurs died even the tyrannosaur
I am guessing you are asking why dinosaurs went extinct. Scientists have not come to a conclusion as to why they went extinct. However, there are many theories which could answer your question. Some scientists believe that dinosaurs went extinct because of a large meteor which could have crashed into the earth and wiped out any exposed animals. There is also a theory that the weather changed for the worst, causing dinosaurs to die. Although there is no agreed answer to your question, it is up to you to decide why exactly they went extinct.
they got extinct
The dinosaurs went extinct millions of years ago, but there is not a conclusive reason as to why. The most widely accepted theory is about climate change - the planet got too hot and the climate shifted too dramatically for the dinosaurs to adapt.
"Without dinosaurs".
Everything that exists. Even dinosaurs were extinct because of the mosquito's sting was poisonous, and when it stung people, they got cardiovascular disease.
Because most of those prehistoric creatures are completely wiped out... if humans had lived in the age of dinosaurs they would have been extinct too, unless in some way they were able to act like sharks, jellyfish, and all other animals that survived and... well... survive. if dinosaurs lived at the same time or after humans, and the dinosaurs got wiped out, we wouldn't be here would we? I rest my case.
some say an asteroid hit the earth and wiped out the dinosaurs. others say the climate got colder and the dinos couldn't adapt.