Does homosexuality exist in the animal world? (Reaction video)

Q1. Does Homosexuality exist in the animal world?
Q2. I personally think that gay people are discriminated because we can’t reproduce, therefore having relatively low contribution to society. What is your thoughts on my opinion?
Q3. Can Homosexuality disappear or be ‘cured’?
Q4. Nature/Nurture?
Q5. If it’s determined by nature, How is it possible to pass down considering humans are gamogenetic?
Q6. Is there particular gene that determines homosexuality?
Q7. If no gay couples have kids, can Homosexuality still be passed down to next generation?