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.
Spencer's Principles of Biology was the first to use the phrase survival of the fittest in print. Darwin agreed that the phrase survival of the fittest was better than natural selection. Natural selection personified nature, but was really about survival. Survival of the fittest would avoid this problem, but it lost the analogy between nature's selection and the fanciers (breeders).