Dinosaurs existed at the very beginning of earth that we know of. They are extinct, so they are not really alive to this day. But you can find sculptures of dinosaurs in the museum. Check for some around you and the people there will help you with any questions you have.
since dinosaurs
Dinosaurs existed. We're not too sure if dragons did. In other words, Dragons exist in the "mind" Dinosaurs exist in the museums. Dragons also exist in literature and in scuplture. Not all dinosaurs are extinct.
No!
by a meteor
No
in the era of awesomeness when dinosaurs were alive.
No.
no, but their ancestors did!
No
No. They are extinct.
Dinosaurs first appeared in the early Mesozoic.
Yes. Birds are descended from theropod dinosaurs.