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A comment on Nine Species of Human Once Walked Earth. Now There's Just One. Parent comment

Re:Nine Species of Human Once Walked Earth. Now There's Just... by toasterlovin on Sunday December 15, 2019 @10:33PM (#21800621)
The answer is probably that we were able to kill them because we were able to outbreed them. They fit into a similar ecological niche, so they would have been competition.
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