The ultimate source of explanation in biology is the principle of natural selection. Natural selection means differential reproduction of genes and gene combinations. It is a mechanistic process which accounts for the existence in living organisms of end-directed structures and processes. It is argued that teleological explanations in biology are not only acceptable but indeed indispensable. There are at least three categories of biological phenomena where teleological explanations are appropriate.

How can reasons explain actions? What is the force of "because" in "He did this because..." followed by a statement of the agent's intentions? The answer involves some concept of what can count as explanation, and the history of science indicates that the acceptability of explanations depends, in part, on a scientific community which has decided to pursue its inquiries in one direction rather than another. The first part of this paper examines this pragmatic aspect of explanations; the second part (...) draws on this examination in the hope of elucidating the way reasons explain actions. The possibility of eliminating our ordinary, "purposive," explanations of actions in favor of some "mechanistic," neuro-physiological, account is then considered. (shrink)

Applies a philosophical analysis of the natural sciences to the social sciences.