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There is no good scientific reason to bring back an extinct species. Why would one bring them back? To put them in a theme park?

Most evolving lineages, human or otherwise, when threatened with extinction, don't do anything special to avoid it.

I accept extinction as best explaining disjoined species. I see that the same cause must have reduced many species of great range to small, and that it may have reduced large genera to so small, and of families.

The one process now going on that will take millions of years to correct is the loss of genetic and species diversity by the destruction of natural habitats. This is the folly our descendants are least likely to forgive us.

If you think about it, every single species is endangered. Homo sapiens at the front of the line, mosquitoes and lawyers at the back.

With the advent of genetic engineering the time required for the evolution of new species may literally collapse.

Most of them are doomed to rapid extinction, but a few may make evolutionary inventions, such as physiological, ecological, or behavioral innovations that give these species improved competitive potential.

I think when you work on fossils, and you realize that a species is there, and it's abundant for quite a long period of time, and then at some point it's no longer there - and so, when you look at that bigger picture, yes, you realize that either you change and adapt, or, as a species, you go extinct.

The dinosaurs became extinct because they didn't have a space program.

Often extinctions in the ocean occur at the same time as those on land. Then again, the ice age extinctions lost many big animals, but not many sea faring ones.