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If primates evolved to upright humans, how come there are still primates around? Why did some evolve and others did not?
Primates evolved to match their environment and to fill ecological niches. Those that didn't do it well became extinct.
The primate tree has several branches. http://whozoo.org/mammals/Primates/primatephylogeny.htm
I am surprised at the question. It sounds like you do not believe in evolution.