Brooding and the evolution of hermaphroditism.
D000818:Animals; D005075:Biological Evolution; D012734:Disorders of Sex Development; D005260:Female; D005306:Fertilization; D008297:Male; D008433:Mathematics; D008954:Models, Biological; D010063:Ovum / Q000502:physiology*; D013094:Spermatozoa / Q000502:physiology*