Each point is true. I guess that's what disturbed the teachers. They can't handle the truth!
In regards to homosexuality and genetics, the work of homosexual activist Dr. Simon Levay has often been used to support the idea that homosexuality is genetic, and his work is still quoted to this day. But what did Levay really find? Here is what Levay said of his own work:
"It's important to stress what I didn't find. I did not prove that homosexuality is genetic, or find a genetic cause for being gay. I didn't show that gay men are born that way, the most common mistake people make in interpreting my work. Nor did I locate a gay center in the brain."
In 1973 the APA (American Psychiatric Association) declassified homosexuality as a mental disorder. According to Levay, it wasn't science that propelled the APAs change, he said "Gay activism was clearly the force that propelled the APA to declassify homosexuality."