GENDER IDENTITY: Biological sex

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Biological sex is a medical term used to refer to the chromosomal, hormonal, and anatomical characteristics used to classify an individual as female, male, intersex. People often refer to biological sex as "sex" or "sex assigned at birth."

Biological sex isn't binary. There are many combinations of chromosomes, hormones, and primary / secondary sex characteristics that make biological sex a spectrum. This view is more inclusive of intersex and trans* people.