Why do gender differences exist? Are these ‘differences’ based on sex(biology, nature) or society(culture, nurture)? Are they inherent at all?

Photo Journal Assignment on Women and Gender

What % of men do you think have your perceptual style?
What % of women do you think have your perceptual style?
Why do gender differences exist? Are these ‘differences’ based on sex(biology, nature) or society(culture, nurture)? Are they inherent at all?