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Debate on gender identity, including the idea that there are only two genders
The short, evidence-based answer: under the classical biological definition tied to gamete type—small sperm-producing versus large egg-producing cells—there are two sexes in sexually reproducing speci...
Current research finds multiple lines of biological evidence — genetic variants, prenatal hormone pathways, and brain structural and functional differences — that together suggest gender identity has ...
Scientific and medical literature offers multiple lines of evidence that support the claim that many trans women are women — including neuroanatomical, genetic/hormonal, epidemiological, clinical, and...