Maximum overlaps of these entities are described in the limitation similarity theory. Seven models for the apportionment of these entities such as dominance decay and MacArthur fractions were ranked by Mutsunori Tokeshi to explain relative abundance distributions. G. Evelyn Hutchinson represented these entities as n-dimensional hypervolumes. Joseph H. Connell proposed “ghosts of competitions past and present” to explain these entities’ “differentiation.” That scientist also studied barnacle habitat ranges in describing the “fundamental” and “realized” types of these entities. The competitive exclusion (10[1])rule that states two species sharing (10[1])identical ones of these entities cannot (10[1])coexist. For 10 points, name these entities that describe how an organism matches its environmental factors. ■END■