The argument isn't that it is only biology, but an interaction.

For example, feminists themselves often argue women are discouraged from workplaces that do not offer work-life balance,  a more harmonious and cooperative atmosphere rather than a competitive one, etc..

Is that nature, nurture, or both?

If transgendered people and gay people are so for "natural", biological reasons, why can't it be that some gender characteristics are distributed differently across genders as well?