Many differences have been proven to be biological.
> unless something is proven to be impossible
But what is your goal? Is your goal just for that number? What if parity is not better? What if the problem of parity is that there is something intrinsic in women that they're just not stupid enough to work 80 hours a week for 3-5 years to have a chance at a few million dollar exit? What if women just tend to not have the same values as men do during the time when their career priorities are most important?
It's much more important that a woman can become a CEO if she has the skills and desire than that 50% of CEOs are women.
> equal representation for all groups in the seats of power
I think you start to tread into different territory here. While I don't believe that half of the women on the board of a company need necessarily be women, I do believe that half(ish) of the women on any sort of government body should be women.