Is homosexuality normal in humans or it's a choice?.

If homosexuality is genetic can it be weeded out? (Even though homosexuals can't reproduce).

Is homosexuality a mutation?.

Is homosexuality mental illness?.

Is the argument that there are animals who engage in same sex intercouse valid?.
Ej: Sheep, Bonobo, King Penguin, Laysan Albatross, Dog, Dolphin).

Homosexuals can't reproduce and considering it is something genetic, then why evolution hasn't eliminated?.

What about bisexuals and transgenders, are they normal too?.

Is gender identity a meme and mental illness?.