 A typical example of a biological determinist view is that of Geddes and Thompson who, in 1889, argued that social, psychological and behavioural traits were caused by metabolic state. Women supposedly conserve energy (being ‘anabolic’) and this makes them passive, conservative, sluggish, stable and uninterested in politics. Men expend their surplus energy (being ‘katabolic’) and this makes them eager, energetic, passionate, variable and, thereby, interested in political and social matters. These biological ‘facts’ about metabolic states were used not only to explain behavioural differences between women and men but also to justify what our social and political arrangements ought to be. More specifically, they were used to argue for withholding from women political rights accorded to men because (according to Geddes and Thompson) “what was decided among the prehistoric Protozoa cannot be annulled by Act of Parliament” (quoted from Moi 1999, 18). It would be inappropriate to grant women political rights, as they are simply not suited to have those rights; it would also be futile since women (due to their biology) would simply not be interested in exercising their political rights. To counter this kind of biological determinism, feminists have argued that behavioural and psychological differences have social, rather than biological, causes. For instance, Simone de Beauvoir famously claimed that one is not born, but rather becomes a woman, and that “social discrimination produces in women moral and intellectual effects so profound that they appear to be caused by nature” (Beauvoir 1972 [original 1949], 18; for more, see the entry on  Simone de Beauvoir).  Commonly observed behavioural traits associated with women and men, then, are not caused by anatomy or chromosomes. Rather, they are culturally learned or acquired.