Biological species is the only possible form of existence for higher organisms: the evolutionary meaning of sexual reproduction.
Shcherbakov
Victor P
VP
Institute of Problems of Chemical Physics RAS, Chernogolovka, Moscow Region, Russia. svp@icp.ac.ru
D000818:Animals; D005075:Biological Evolution; D012098:Reproduction / Q000502:physiology*; D012641:Selection, Genetic; D012726:Sexual Behavior, Animal / Q000502:physiology*; D013045:Species Specificity