But--I would argue that this isn't purely determined by biology, but by society. Countries like Norway are ahead in terms of women in leadership roles because they have policies for family leave, child care, and work to change gender-based stereotypes which are a major barrier to women�s participation in decision-making. It is one thing for women to recognize that given current circumstances, it would be very difficult to be a CEO and a mother and to choose to be a little less ambitious. It is another thing to say it is determined by biology.