I don't think so, If they are both over the age of consent then no.
it depends on what the age of consent is in your state.
technically yes but unlikely
Whenever the male begins to produce sperm he can get a girl pregnant.
No.
He would be charged with statuatory rape for having sex with a minor, there is no extra penalty for getting her pregnant.
The age of consent there is 16 so it's legal.
The sperm from the male has to meet with the egg from the female
yes
A vasectomy prevents a male making a female pregnant. It does not prevent a female getting pregnant since she could get pregnant with a male who has not had a vasectomy or by artificial insemination.
no because she is already pregnant by the other male
noo
Either testicle is capable of getting a female pregnant. Even a male with only one testicle can get a female pregnant.