Why are some south asians light skinned and dark skinned ?

because pakistanis, north indians, etc had ancestors europe (white skinned) came indian subcontinent under indo-european expansion , interbreeded local south asians, dark skinned , result in kind of "mediterranean" skin colour. interestingly don't see many dark skinned arabs, despite them living in hot temperatures. what's analysis ?

is because pakistanis, north indians, etc had ancestors europe (white skinned) came indian subcontinent under indo-european expansion , interbreeded local south asians, dark skinned , result in kind of "mediterranean" skin colour. also...

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