There is no 'possible' about it. Starting a fight is an auto-ejection in HS and NCAA.
It is a 15 yard personal foul, as noted.
yes
A penalty is declined in football when the team that committed the penalty would benefit more from the result of the play than from the penalty yardage.
There is no penalty for that
There is no evidence that such a penalty exists in any football league currently.
No, a holding penalty in football cannot be declined by the opposing team.
Elbow
Elbow
The football penalty was declined by the team because they chose not to accept the penalty and instead opted to keep the result of the play as it was.
No, a delay of game penalty in football cannot be declined by the opposing team.
No, a false start penalty in football cannot be declined by the opposing team.
When a penalty is declined in football, it means that the team that committed the penalty chooses not to accept the penalty. The result is that the play stands as if the penalty never occurred, and the opposing team can choose the outcome of the play instead.
This penalty is called "Clipping".