A. recovered
B. ethics
C. ensure
D. technologies
E. pose
6. Many extinct species are dead, but their DNA can be ________ from samples and fossils in museums, even those up to 200,000 years old.
7. We can preserve species through the use of genetic engineering and reproductive _______.
8. Before cloning any animals, scientists must _______ that the animals can live their lives well in this world.
9. Many people believe that cloned mammoths might ______ problems to our ecosystems.
10. I’d like to know whether humans have _______ to clone other animals. Do we have moral obligations to do it?