You throw out terms like 'full fledged' because you have never made a post or argument that didn't originate in the 17 or 18's racist ideology. You should look out side of that for answers. Without looking anything up, what do you believe makes up a civilization? Parts of Europe during the dark ages don't even meet some of that, so........
There is no explanation needed about the Aborigines, unless you also based your entire POV in racist ideologies of *yawn, 1700's and think that African's had unified features before leaving. We know what feature stick out as sub sarahan, you can even see those in Americans and South Asians today, but it's not like there was no diversity - to assume that is ridiculous considering all diversity comes from the original. Just to clue u in South Africans and West Africans ate different foods for 10's of thousands of years. David Unaipon doesn't look like Nasir Jones because They look how some indians would look if some indians didn't have racist matting habits and some euro groups didn't mix in. 60K years ago when they split, they looked just like Africans. They are direct descendants of people 50K years ago - There was nothing but black Africans on Earth 50k years ago. To put it in more perspective.... it wasn't until 6K years ago that people started to change to med-brown skin color.
The Australian Aborigines left Africa 75,000 years ago and have been living in Australia for over 50,000 years ago with no contact with the outside world until white folks "discovered" them. Aside from skin color, what do Aborigines have in common with Africans today? The answer is nothing. This isn't "racist ideology," this is your own logic being used against you. It goes to show that when you try to back to 7,8,9, or 10,000 years back to try and make an argument for people in Asia looking like "black Africans" you're really just grasping for straws. 10,000 years ago humans in different parts of the world already had their own cultural, and "racial" distinctions and made affiliations accordingly, those unique distinctions manifested themselves in the civilizations that would come about later on in the human time-line.
If you think that every human variation in terms of race, skin color, etc. that we can observe today only took 6,000 years to come about then I'm sorry, you're heavily deluded.
....Now, you're babbling something about diet
you on some other shyt, for real.