Evolution is random. it didn't happened because of g-d, or weather, nature etc. In nature the fittest survives & pass on the genes to the next generation. The weak or ill will die out & those genes are not be passed on. The reason we are different in color, structure, & race is due to our ancestors migrating to different part of the world. People who ended up in the north with cold weather less sun passed genes that didn't focus on dark pigments. So, dark pigmentation in the skin was blocked & not passed on. Similar to the hot regions where there is a lot of sun, dark skin pigmentation switched on & was passed on to the next generation. These features & skin colors became dominate in each region due to isolation. Plate tectonics separated lands on earth. Therefore preventing any mixing with other races. The Asians & the Indians is believed to have been 1 race but split due to plate tectonics this 1 race got separated; 1 going into north america the other towards the east. Due to isolation & inner breeding is why we, have these different races. When our ancestors started exploring & found the ability to travel, was how inter racial mixing started. Intelligence or talent is not a racial thing. Asians are not smarter because they are born Asian, it's because their education start even before the child is born. Most, Asian parents start training while the child is still in the womb. Education is stressed strongly in an asian house hold. Similarly Black children are not good in sports because they are black or African. The skill is stressed strongly with the family & school & coach. Every race have equal potential for abilities in the area of intelligence & talent & in all other areas. It only needs to be harnessed & practiced. We are not related to the apes. Even though, we are 99% genetically similar to them that 1% separates us from the apes. Scientist have discovered a little black woman in Africa which they named Eve. She is neither human nor ape more like in between. So, if she is our descendant; we come from a little black woman in Africa. Therefore, we're all black! With inner racial mixing today, in couple of years, we will probably look more like the spanish give or take. I see it everywhere now,I saw an African american & White couple with a child that looks spanish. My brother is American Asian-Pacific islander/spanish & my sister in law is scottish/english american indian. My nieces both look Spanish. Poor Cindy, she get's mad when the teacher would always hand her a little red headed child to take home. She would always have to explain that the tan child with wavey brown hair was her kid. lol So, we can all let go of the race excuse & understand that we are all Mutts.
Mariee, I hope this helps. If you wish to go into further research go for it. I love it when others want to learn! Sorry, it couldn't be more specific it's been a while since college & my anatomy,physiology,biology, genetics, & chemistry is a little rusty off the top of my head. Knowledge is Power