I was reading about this and i was interested to see what other people thought of it.
Most Helpful Girl
It's called co-evolution. All modern day Homo-sapiens or humans evolved from the same original species, just did so in different ways to adapt to the very different environments we lived in at the time. Which eventually gave way to humans having different races. Black people evolved the trait of higher melanin concentration in their skin for if they were white and lacking it, they would all have been killed off by skin cancer sooner or late. Likewise why east Asians evolved the mono-lid and flatter nasal bridges to adapt to the harsh weather conditions like wind, dust, and very cold temperature around where they were situated at the time.
I'm not really sure why you're asking if black males and females evolved from different species instead of asking about black, white, oriental populations tbqh. Though same answer would apply nonetheless.
&to answer something else you commented on another user's opinion, birth control and abortion aren't really affecting evolution itself all that much. More like those things, in addition to medicine, getting rid of natural selection.0
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Most Helpful Guy
Firstly we are the only a species in our genus, so we don't need to physically differentiate ourselves from them to have success in reproduction.
Then look at another animal with large differences amongst individuals, like the different colors of the Pacific chorus frog or banana slug, to the different sizes of grizzly bears, and consider why that might be. There is no reason that requires it, except that come a bottleneck event, natural selection will have more advantageous individuals to work with. Genes naturally have multiple ways they can express themselves, and when their aren't a lot of non-relatable but similarly looking species, specific identification isn't an issue, so populations tend to drift apart like that. Now consider the ranges of the animals I examples. They have had considerable success in their range, but humans have no range restrictions, apart from open ocean and ice shelfs, and arguably high mountain and true desert.
Therefore, our genes Will be of benefit to us when they express in different ways to people of different regions, and natural selection will slowly but surely cause unique populations to evolve.
Lastly, consider that birds can tell other birds apart individually, and they likely see us as tall human fat human. So what you see as the same, to them is very different, and to them we are the same, you see us as very different. We are simply more familiar to the minutiae, and I would argue that while we all look different from each other, we don't look "very different"0