Doubts that random mutation provides sufficient variability for natural selection of complex biochemical processes; perhaps mutation is non-random? (AL)

A review of On the Biology of Learning (Harcourt, Brace, 1969) edited by Karl H. Pribram. (CK)

Considers natural and cultural environmental factors likely to have been responsible for reduction in size of hominid teeth and simplification of their morphology during the Pleistocene. Cites fossil evidence and postulates selective mechanisms. (EB)

Applies mathematical models to the concepts of ecological dominance and ecological niche. Considers niche width, the addition of new species to a community, and the evolution of dominant and subordinate species within a community. Analyzes data from other studies to support the models. (EB)

Presents 11 statements from the American Association of Physical Anthropologists (AAPA) as revisions of the 1964 United Nations Educational, Scientific, and Cultural Organization (UNESCO) statement on race. (YDS)