He then observes that the mark of higher forms of life is that they are actively engaged in modifying their environment, an activity which he theorizes is directed toward the three-fold goal of living, living well, and living better.
Han henviser derefter til det, at de højere livsformers særkende er, at de aktivt omformer deres omgivelser, en aktivitet som han formoder er rettet mod livets tredelte mål, at leve, at leve godt og at leve bedre.