I disagree with you slightly. Racism has probably always existed but it was in the 19th century that Dr Samuel Norton categorised humans into 5 categories based on race and suggested the 5 races were created seperately.
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Replying to @TerryExSci @CubeSteve and
It was actually Blumenbach who proposed it. Philosopher of science Quayshawn Spencer verified his model which he calls Blumenbachian partitions: http://sci-hub.tw/10.1086/677694
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Replying to @Race__Realist @CubeSteve and
Blumenbach did categorie humans into race but he claimed that black Africans were not an inferior race. My argument is that it is Dr Morton's work is what legitimised racism, based on physiology, as he explicitly said that white people are the superior race.
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Replying to @donderoen @Race__Realist and
Morton suggested that white people were naturally more intelligent, have a better grasp of abstract thought etc... You exaggerate how different "races" of humans actually are. I encourage you to human biology, the differences are no different between race as inter-race.
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Replying to @donderoen @Race__Realist and
Again, they're not, otherwise we wouldn't be able to reproduce with people in different parts of the world.
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Replying to @TerryExSci @donderoen and
Lions and tigers are interfertile Jaguars and lions Spinner and striped dolphins Dogs and wolves and coyotes and jackals Zebras and horses Zebras and donkeys Polar bears and brown bears European honey bees and African bees
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Replying to @CovfefeAnon @TerryExSci and
their offspring are infertile iirc
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Some cross species matings produce fertile offspring, some don't
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