Is it possible? Surely. Scientists have already successfully cloned animals, though I suppose it depends on your definition of "success". Humans are animals too, and a collection of tissues and organs, so certainly the scientific potential is there.
It is controversial and illegal for a number of reasons, moral in terms of our definition of humanity and life. Unethical in that most people would agree that humans are not meant to be the basis of experimentation, or at least not have that be the purpose of their existence. All humans have rights, so would clones? It is so legally problematic it boggles the mind.
So while I hope it does not happen, scientific history suggests that it will at some point.
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