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.