A day without fire story
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Answer:
Normal. They would get along fine because nature wouldn't have pressurized them to discover fire or manufacture iron or the wheel.
Nature put a presurre on those humans who did not use fire coz they would have got eaten by some cat or doggo or worse, bitten by an insect. Worst they would have frozen to cold.
Similarly, The humans who did not use wheel or iron would have been killed by humans who did have metal spears and swords and came galloping on horse charriots.
The ones who may have survived would have been slowly reduced to extinction because you need a minimum viable population to keep the gene pool healthy and fit.
This is what happened with bonobos chimps and orangutans. We all shared the same mummy daddy back into 10 million years from now. Just that some of their children developed bipedality and fire and diverged genetically from the great apes.
I hope this will helps you.
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