Enough genetic material to resurrect a viable population of Homo Neanderthalensis and Home Erectus has been collected. Additionally, sufficient knowledge has been garnered to proceed, albeit with some minor technical hurdles.
Whilst the cultures of these people could never be replaced or fully reconstructed, serious facsimiles or "best guesses" could be established to give these people a running start at self-sufficiency.
Ethical consideration for such a project would need to be resolved before such a project would, or even should, begin.
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