system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why aren't humans of different races divided into different species?

There's a brown bear, a white(polar) bear, a black bear, and a bunch of other bears in between. They are all their own individual species. There are three different species of gorillas, all of them look marginally different from each other, and yet humans, who happen to look marginally different from each other, are all one species. Is it a race issue? Were scientists afraid that KKK members and the like would look down on races other than white as "not people?" Is there something else that separates bears and gorillas, and not enough of that thing to separate humans? What defines a species? What is enough to make one species of animal classified separately from the rest?
gpt
Two animals are considered to be of different species if they can't produce fertile offspring. This isn't the case for people of different races. Furthermore, race is not considered a particularly meaningful category in biology.