They did a study in 2013 too prove that a comet killed the dinosaurs, it would stand too reason that for loss of better word early man type at that time die too.
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Humans were Probaly not at the evolutionary stage of being 'human'. Humans have said to evolve from apes...so how did the apes survive? Well if a comet hit the earth everything being wiped out. Firstly the earths environment would have to grow back therefore creating microorganisms like bacteria and fungi. These microorganisms would evolve over a long long period of time until they became walking apes then 'humans'. This is just a popular scientific theory (evolution) just like the comet wiping out the dinosaurs.
A big part of science is conjecture, which means making up "What if" scenarios. Often those scenarios get discussed a lot for a long time, and people begin to assume they are true just because they keep hearing them. There is a crater at Chicxulub, but no evidence of a comet. That is true all over the Earth: craters but not comets. It is much more likely that the craters were caused by cosmic lightning, of which there has been plenty in recorded history. But the team that investigated Chicxulub had no training in electrical effects, so they conjectured a meteor and we are stuck with that story.
I understand, still a good talking point with myself and my brother, there a samples of tons of materials that science haven't verified or studied. I like too think that every trace of things unknown would show all evolutions of man is recorded and verified.