I'm thinking of facial structure, not skin colour. I understand why do people from different areas have different skin colours, but I don't get how did the facial structure change.
Most Helpful Guy
Some changes can be useless. Groups can still develop differently just by being isolated from one another, even useless genetic variations can get passed on withing a region, leaving people looking different.
I've heard arguments that black people's noses are bigger to take in as much air as possible, the are larger and need more air, also they did a lot more running I think. For white people in the winter, longer noses warm the air more before it hits the lungs. Slanty eyes... yeah, no idea. I think most facial structures are just useless variations that become prevalent in homogeneous groups.3
Most Helpful Girl
Same genes different mutations.
Diversity of our genetic patrimony :p
I don t the English word of all of this so I am gonna tell yoi a small story.
You have a type of butterfly
There from this type 2 colors black and white.
It happened to be that during a period of time the rocks in the area were white so you d see there is more white butterflies here than black ones. Cause it s easier to cammouflage and hide from their pretadors.
And vis versa.
So it s a bit similar with us, if you got what I mean.
Thia is called I guess genetic selection. There is still more but oh well1