title: Contributions to the theory of organismic sets: why are there only two sexes?
mesh_terms: D000818:Animals; D018407:Bacterial Physiological Phenomena; D005823:Genetics; D006801:Humans; D008433:Mathematics; D010247:Paramecium / Q000502:physiology; D012098:Reproduction; D012723:Sex; D013997:Time Factors