“Useful” in this context does not mean “might come in handy” or even “useful if they suddenly appeared”. It is a much more restricted sense: “any step in that direction gives an immediate advantage over others of the same species”. read more
Humans ARE primates. Mammals evolved from animals that were similar to reptiles, but they did not evolve from reptiles. Reptiles are a group of animals that evolved around the same time as the first mammals. Reptiles and mammals are part of a group of animals called amniotes. read more
Humans did not evolve from apes, gorillas or chimps. We are all modern species that have followed different evolutionary paths, though humans share a common ancestor with some primates, such as the African ape. The timeline of human evolution is long and controversial, with significant gaps. read more