No. Not all college football players go to the NFL, not even all division 3 college football players go into the NFL
Approximately 7% of all college football players get drafted into the NFL.
The exact number of Division 1 college football players is unknown. However there are a total of 80,000 college football players across all divisions.
No. You have to be drafted
No, it's a measure of diligence or daddy's wallet. Football players "graduate" all the time and half of them have suffered some sort of brain trauma.
ya all levels of football do that
all of them and your a jackass
The majority if not all of them definitely take steroids especailly in d1 and d2 college football.
No. In fact you don't even have to huddle.
NFL - yes. Almost all NFL players have attended a college, though not all graduate before they move up to the NFL. Association Football (soccer) - No. Very few professional soccer plays in Europe & South America have attended college. Most soccer players turn professional around the age of 18, so it's difficult to combine professional sports with a university education. Some do though (Steve Coppell is a famous example).