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.
The essence of the process of evolution is the survival of the fittest: The ability of an organism to cope with changes in its environment in order to assure its survival and replication. In the perpetual struggle for survival, all living organisms are constantly engaged in a battle for limited resources.