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.
19. Why is it said that evolution acts on phenotypes and not genotypes? Selection acts on phenotypes because differential reproduction and survivorship depend on phenotype. The relative fitness measure is a dynamic assessment subject to co-evolving population.