Question

(honest question) How come whenever archaeologists uncover human remains they are always male or female and not any of the other 7 billion genders?

Answer 1

I think you're confused. There are only two sexes, male and female. Sex is what you were biologically born as from birth, while gender is what you choose to identify as. Gender is a choice, sex isn't. They couldn't discover any other genders because at the time they probably didn't even know what gender was like three thousand years ago, therefore they couldn't look like a different gender.