Lol but for real tho, check out the diseases [en.wikipedia.org] or [en.wikipedia.org] for some really ambiguous genitalia and gender questions that start to sound a lot like "god of the gaps". What is a male? Somebody who has a penis? Someone with an XY genotype? Someone with an SRY gene? Someone with a wild type SRY gene? Someone with a fully functional SRY gene and who doesn't have a heretofore undiscovered mutation that results in the trans phenotype? Only time will tell, but I do know that the scientific resesarch around biological sex uncovers new nuances, necessitating any gender classification system that solely relies on biology to incrementally redefine what "male" means. The nice part about the contemporary sex/sexuality/gender identity framework is that it has some non-biological leeway, allowing people new vocabulary to express their feelings without needing to wait for some biologist to figure out the mechanism behind their feelings. I suppose that is a liberating and informing thing, even if it is not yet scientifically validated.

If they keep going , everybody will flunk Biology

And I knew (and laughed about that) 58 years ago in First grade

That meme never gets old...