The Diagnostic Question Cluster (DQC) project integrates education research and faculty development to articulate a model for the effective transformation of introductory biology and ecology teaching. Over three years, faculty members from a wide range of institutions used active teaching and DQCs, a type of concept inventory, as pre- and…

The blending of biological and technological knowledge of regulation and control formed the impetus for synthesizing the thesis of holism and the antithesis of reductionism to the metabiological systems theory. In principle, the possibilities have thereby been created to bring many transbiological systems under control again. (RH)

Discusses interdemic (interpopulation) selection, the Levins and Boorman-Levitt models, and the significance of group selection for ecology. (JR)

Presents a mechanical analog designed to reduce the conceptual difficulties experienced by many students in thinking about age distribution concepts in demography. (JR)

Examines aspects of competitive exclusion, which develops when two species jointly utilize a vital resource that is in short supply. When this occurs, one of the species will eventually eliminate the other from the habitat where their distributions overlap, unless one or both species evolve differences that reduce competition. (JR)