The term often leads into confusion, however, since international compact cars are somewhat larger than their North American equivalents, mostly because no supermini/subcompact size is manufactured by American, Mexican and Canadian car makers up to date.
By the late 1860's, Darwin came to describe this process as the survival of the fittest. This is very different from Lamarck's incorrect idea that the environment altered the shape of individuals and that these acquired changes were then inherited.
Darwin wrote 'survival of the fit' to imply that those who were fit would live long enough to pass on their genes. Spencer wrote 'survival of the fittest,' implying those who were most fit would survive the social world due to some biological mechanism that made them superior.