Fill in: excavate, clone, roam, reactivate, and revive, in the correct form.
1.Scientists believe they will be able to.extinct animals in the future.
2. Archaeologists are very careful when they.
artefacts from a site.
3.Some scientists hope that they can.
dinosaur DNA.
4.Dinosaurs.
the Earth over 65 million years ago.
5.Scientists have already. one sheep from another.