Nature and nurture both play important roles in an individual’s sex and gender identity. Nature refers to biological influences, such as chromosomes, hormones, and brain structures, which are largely responsible for the initial development of an individual’s sex and gender identity. Nurture, on the other hand, refers to environmental influences, such as parenting, culture, and society, which can shape an individual’s gender identity and expression. While some aspects of sex and gender identity are predetermined by nature, nurture can also play a key role in shaping and reinforcing an individual’s gender identity and expression. In this way, both nature and nurture contribute to an individual’s sex and gender identity.