 With significant provisos to be noted below, Creationists are strongly opposed to a world created by evolution, particularly to a world as described by Charles Darwin in his Origin of Species. Creationists (certainly traditional Creationists) oppose the fact (pattern) of evolution, namely that all organisms living and dead are the end products of a natural process of development from a few forms, perhaps ultimately from inorganic materials (‘common descent’). Often this is known as ‘macroevolution’ as opposed to ‘microevolution,’ meaning apes to humans rather than merely one species of finch to another. Creationists also oppose claims about the total adequacy of the Darwinian version of the theory of evolution, namely that population pressures lead to a struggle for existence; that organisms differ in random ways brought on by errors in the material of heredity (‘mutations’ in the ‘genes’); that the struggle and variation leads to a natural form of selection, with some surviving and reproducing and others failing; and that the end consequence of all of this is evolution, in the direction of well-adapted organisms.