The main biological difference between the brain of women and men it's related to its volume. Since cis women gender (women who identify with the sex they were born with, i.e they have feminine reproductive organs ) is usually smaller than cis man gender ( men who identify with the sex they were born with, i.e masculine reproductive organs), usually their brain (women's) is also smaller than men. This difference of volume usually brings rigged other characteristics too, e.i smaller brains allow a slightly bigger proportion of grey matter compared to white matter, and more connection between both hemispheres (which is related to multitasking) compared with the connections inside each one of them.