Most 19th- and 20th-century evolutionary theories (and theorists) asserted that evolution created two kinds of creatures—male and female—and individuals’ behavior and nature reflected this biological ...

Multiple species of brown algae (class Phaeophyceae), for example, have evolved over time from a male/female binary into co-sexual hermaphrodites. Susana Coelho, a biologist at the Max Planck Research ...