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Is it possible to clone an extinct dinosaur?
A fossilized spider trapped in amber.
Some science fiction proposes cloning dinosaurs from the traces of their blood found inside the bodies of biting insects fossilized in amber. This amber specimen has a spider trapped inside.
 

Cloning is a complicated issue. Here's as simple an answer as I can give. To clone an animal, you need the complete genetic code, the blueprint of how the animal is constructed. The genetic code is huge and complex. It consists of long strands of DNA which generally don't survive the fossilization process. Even if we did have the genetic code for extinct dinosaurs, the technical aspects of creating an embryo and growing it are virtually impossible.