>both have SOME scientific basis. Race isn't clearly defined >but there are genetic traits that are common to people with >shared ancestry. For lack of a better term, that's race. If I >need a bone marrow transplant, I won't be able to get it from >a Korean.
agreed.
>While both race and gender are fluid, they're fluid in >different ways. We all have biological parents of different >genders
no. we all have bio parents of differing SEX. it is entirely possible for 2 persons who identify as women to produce a baby - the old fashioned way - as long as one of them produces sperm and has a penis (aka is biologically male) and the other has a vagina and at least one ovary that produces eggs and has a uterus, et al (aka is biologically female). i know of trans couples who have reproduced this way.