One of the most difficult things to keep in mind about evolution is that when we say things like, "Genes want to make more copies of themselves," or even, "natural selection," we're actually using metaphors.
W przypadku ewolucji najtrudniej zrozumieć zrozumieć, że stwierdzenia jak: "geny chcą mieć jak najwięcej kopii" albo "naturalna selekcja" to metafory.