every material difference between the defined binary sexes is either malleable, a slight statistical difference, or unobservable to the point irrelevance
Biological Sex is chromosomes, hormones, gametes, gonads, a whole load of epigenetic stuff, various organs like breasts etc

The only reason transphobes go on and on about chromosomes is because they are the only part you can't change with transition, not because they're important. They aren't

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