How does an extinct species comes back in the wild?

Question

I was browsing through reddit and I found a picture of a European Bison, and it was said that that species was once extinct.
So I wonder, since a certain specie that goes extinct, loses their ability to reproduce, how does an extinct specie comes back?

Thanks!

In: Biology

Answer 1

It was never really extinct. No one had seen one in a while and presumed it was extinct. When they’re gone they are gone. They don’t come back.