General biology courses should be planned and taught in colleges according to widely accepted theories and laws of biology. A list of 24 such principles is provided around which general biology courses could be structured. (PS)

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)