How will archeologists in future years, when analyzing old bones, determine what sex the person was? They will have no way to prove transgender?
Weird thoughts!
Yes, some species of fish and others have the ability to change sexes if the need arises. But those are fully functioning reproductive systems.
But analogies to human transgenderism or homosexuality as we observe among a tiny minority of the population?
It's not there. Show me a transgender ape or a lesbian elephant or a homosexual sperm whale.
If homosexuality and transgenderism is a natural phenomenon, it should follow that it is observable across much of nature... yes?
But, it is not so. Nature among the higher animals is very nearly 100% sexual with two distinct genders. Not three or five or twenty-seven.
Why must we now accept that humans are a wild exception?