Back in the caveman nights it was the strongest who survived.
You had to stay healthy & strong no matter what or you were gone.
No medicine, fantastic shelter or steady food. Those people were hearty. They just lived off the land & the best ones got to live. If you did that to people now, the two of us would not do so hot. I would be picked off within a week, however for one, I am totally used to having weather conditions control. I have zone control for our house, and every room is set to a particular temperature program. I get A/C when I work out, heating when I sleep & quality cooling when I have lunch. I even control the humidity levels in those spaces, however, the main issue for myself and others in the wild would be the air quality. I have a dehumidifier to work with our a/c. I have a humidifier for our furnace. I have an air purification plan & UV lights installed in the Heating & A/C, however any little air quality device you can come up with, I have it. I want our indoor air conditions to have the right amount of moisture & be clean. That is because our skin dries out or breaks out easily. I also can get sick from dusty air conditions. Can you imagine myself and others as a caveman? I heard the outdoor air quality is really cleaner than inside, but what about how dry it gets in the Winter & moist in the summer? I would be dead or ready to kill myself without our IAQ equipment.