Are turtles or crocodiles dinosaurs. And why don’t dinosaurs exist anymore?

What makes a dinosaur a dinosaur? Wouldn’t a turtle or crocodile be one.. also if the dinosaurs was wiped out by an asteroid or however it happened it has been millions of years wouldn’t they come back by now just like the very first animal to live in the world would, because you can’t give birth to the first... show more What makes a dinosaur a dinosaur? Wouldn’t a turtle or crocodile be one.. also if the dinosaurs was wiped out by an asteroid or however it happened it has been millions of years wouldn’t they come back by now just like the very first animal to live in the world would, because you can’t give birth to the first animal it was just made by nothing. I’m confusing myself here.
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