Are the differences between men and women biological or social????
Well!!!. My answer will be that biological differences lead to social differences.

The biological differences mean differences in chemicals, such as males have far more testosterone than women and women have far more oestrogen and progesterone than men.
Men are physically stronger than women with more developed upper body strength.

The chemistry of men's brains are different than women's. Men and women tend to rely more on the opposite side of their brains to work out problems, although women tend to use both sides more than men. women tend to be better at multi-tasking, whereas men tend to be linear thinkers. Women experience pregnancy, birth and suckling. And men do not.
These are just a few examples of a biological differences.

And because of that we found differences in social situation between men and women.