The study of evolution is an evolution in itself.

Theres no environment I can think of that would have remained constant enough to preserve dinosaur DNA.

I laughed when Steven Spielberg said that cloning extinct animals was inevitable. But I'm not laughing anymore, at least about mammoths. This is going to happen. It's just a matter of working out the details.

There is no good scientific reason to bring back an extinct species. Why would one bring them back? To put them in a theme park?

The study of evolution is an evolution in itself.

Nuclear DNA encodes all the proteins and enzymes that make you you, basically.