Emu1981 t1_j52xrle wrote
Reply to comment by HornedDiggitoe in Given that reproduction is difficult or impossible when both animals have different numbers of chromosomes, how did so many species evolve to have so many different numbers of them? by MercurioLeCher
>Imagine what the life expectancy was for disabled/sick people prior to an abundance of food.
What makes you think that there was no abundance of food before the discovery of agriculture? Hunter gatherer groups tended to migrate around to follow the food over the seasons. Between this and the low populations it would have been pretty rare for the groups to go hungry over a long enough period of time for individuals to starve to death.
Agriculture and animal husbandry is what allowed for humans to settle down and to start multiplying like rabbits.
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