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Young-Ice;4216005 said:
Humans are done evolving for the most part. Immune systems and the likes are still evolving, but in regards to significant physical features it seems to be done as there is nothing else for us to really overcome on this planet at the moment - we are the dominant species.
No, humans are constantly evolving.
Recorded human history only goes back a few thousand years, a mere 2.5% of the time since they speciated.
We haven't been around long enough to conclude that we've stopped evolving.
How else would we evolve physically at this present moment with no predators or harsh geography to overcome?
Changing environment/habits, selective breeding, natural genetic variation.
You know, the usual ways in which biological evolution occurs.
We spend very little time adapting to those things due to houses, cars and the like. We're not changing much physically.
Houses and cars are examples of the changing environment.
You saying we're going to adapt to the controlled environments of those things? What possible changes could be evoked?
Modern houses better protect humans from the climate, and cars reduce the amount of foot travel for humans.
A likely environmental example is modern obesity.
Another example--that's likely to be a product of selective breeding--is how humans have been getting taller.
Height isn't very significant
Subjective.
It isn't subjective if I can provide adequate objective evidence.
If men were to grow sufficiently larger overnight not a lot would change in regards to the way we live. Clothes would have to be bigger, houses reconstructed, diets would probably need modification and so on. Nothing too significant in regards to how we live though.
In comparison, something significant such as the development of a new lobe in the brain, wings, gills, or walking up right would completely change the way an organism lives and develops. Size was considered beneficial in earlier economies where labour jobs were abundant. With the advent of technologies that do the labour for us however, size and associated strength and power are no longer issues as methods and tools have evolved to make work easy even for small sized humans. The impact of increased size is small.
This shit isn't magic yo; that kind of change doesn't happen in complex organisms over such a short period of time.
Even in cases of speciation; the newer species typically only varies slightly from the "parent" species. Take the blackcap I mentioned earlier for example: The newer species had only slightly rounder wings and longer beaks; small changes basically.
Evolution is the mainly a summation of many small changes rather than one big change. If changes are summed over time, the shorter amount of time you looked at, the smaller the sum of the changes will be.
Over the past 300 years human height has increased after remaining rather stagnant. Countries once known for their short people became countries known for tall people. The contributing factors are likely nutrition and selective breeding.
A noticeable difference in height over a relatively short time is a significant change for a species.