title: Cooperation within and among species.
authors.affiliation: Department of Integrative Biology, University of California, Berkeley, CA 94720, USA. jlsachs@berkeley.edu
authors.forename: J L
authors.initials: JL
authors.lastname: Sachs
mesh_terms: D000533:Altruism; D000818:Animals; D001522:Behavior, Animal; D005075:Biological Evolution; D003299:Cooperative Behavior; D006801:Humans; D008954:Models, Biological; D012641:Selection, Genetic