1) wow, talk about circular logic..Well humans for one like your own link says, moron. Did you not read it? Can you even read?
Hence isn't an argument. It's a suggestion of one. What about makes them different that the need to compete in different leagues? Males typically produce more testosterone than females but some males have a genetic condition where they produce less and some intersexed females produce a lot more. If your concern was testosterone levels for instance then sport leagues would be divided by your testosterone level, not your sex.
2) you don't know what about men and women are biologically different? hahaha....wow....first, hormones, second reproductive organs. Hormones are a big thing though, men produce more testosterone, which in most cases, makes them bigger and stronger.
Yes, it is true that humans, both male and females can have disorders impacting their development. With that said, it's a small percentage of the population. But at least now you are admitting it's a genetic disorder, and not natural, but in fact, a disorder.