Men had to fight and compete with each other and better themselves in order to survive and continue society while women remained more passive. Also males had more mental power than women. Use specific examples. We expect human gender roles to carry over to other species. For example, male birds must dance to attract the female.
Male bees dance as well to attempt to win over the female.
This relates to human gender roles because we see the male as the active role and the female as the passive participant. Because science is our religion. We believe that science is about facts. Norms of race and dominance when it is proved. Marriage is a cultural conduct.