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That is a long term phenomena - long enough that evolution by natural selection can operate. Nothing to do with less than a thousand years/a few dozen generatio
by abdullahkhalids 7y ago
That is a long term phenomena - long enough that evolution by natural selection can operate. Nothing to do with less than a thousand years/a few dozen generations.
- lugg 7y agoEvolution and natural selection do work on those timescales. Take a look at rapid evolution for examples. I'm not sure how fast exactly human birth ratios swing but I would hazard a guess a few dozen generations would be enough to self select at least partially back towards the norm. How long did it take the worlds population to recover after WW1/2? I'm happy to see evidence contrary but please don't just dismiss things as if evolution is working on geological timescales it's just not.