system
Given the following post, respond as if you're commenting on Reddit:
human
Even though Jurrasic Park is fictional, is the science possible to make extinct animals alive once again using extremely old DNA?

How would it work?
Does DNA go bad?
What would be the errors in creating extinct animals?
gpt
The half-life of DNA is such that you'd never get a decent enough sample of a dinosaur to clone it. A mammoth though? Sure.

Assuming we did, by sheer dumb luck, somehow find a dinosaur so well-preserved that we could somehow extract a complete enough genome to use to clone the animal though, a new set of problems would arise. Firstly, you need some kind of similar creature to bear the organism as a surrogate mother. With a mammoth, an elephant should do just fine, but a dinosaur? There aren't any reptiles large enough to lay a T-rex egg. Even if you did somehow grow the dinosaur in-vitro in a prosthetic egg or something, you'd still only have a genetically similar (not identical since some damage is inevitable which must be repaired with, for example, frog DNA) creature, not an exact replica. For example, you'd have no way to teach it how to be a T-rex, since we have no idea how T-rex behaved and no similar animals to be a surrogate mother.