Which ones?
no
http://homepages.cae.wisc.edu/~dwilson/rfsc/Div1A.shtml
Click on the 'Division 1-A Teams' and 'Division 1-AA Teams' links on this page to see all time win loss records as of the start of the 2007 season.
4 teams in a division,16 teams in the NFC all by itself,16 teams in the AFC all by itself,and 32 teams all together.
All states have college football teams, but not even half of the states have NFL teams.
The 49ers will face play all teams in their division twice, plus all the teams from one NFC division and an AFC division.
It is not a requirement, so nope. That's not to mean that they haven't over the years.
Yes. They were all National Football League teams before the 1970 merger with the American Football League. Today, they play in the National Football Conference's East division.
Division 1-A: Memphis, Vanderbilt, Tennessee Division 1-AA: Austin Peay, Tennessee State, Tennessee-Martin, Tennessee-Chattanooga, Tennessee Tech
Click on the 'Division 1-A Football Colleges' link on this page to see all schools that play NCAA Division 1-A football. Click on the 'Division 1-AA Football Colleges' link on this page to see all schools that play NCAA Division 1-AA football.
No. Division 1A (aka, FBS) football teams have not played D-2 football teams in several decades; however, most Division 1A teams now host one game against a team from D-1AA (aka, FCS). Some 1A teams even host two 1AA teams in a season, such as last year when Florida State hosted Western Carolina and Chattanooga. Do not confuse Division 2 with Division 1AA. Keep in mind that D-1A football teams are simply D-1 for all sports other than football, while D-2 teams are D-2 for everything. For example, D-1A football schools like Villanova, Georgetown, and Davidson have basketball teams who compete for the D-1 national championship. Notre Dame has not played a team from D-1AA (FCS) since D-1AA came into existence in 1979. Appalachian State has no agreement whatsoever to play Notre Dame in football at any time in the future, but ASU does have contracts to play at East Carolina, Georgia, Virginia Tech, and Florida over the next several years.
In the 2009 season, there are 120 Division 1-A football schools, 117 Division 1-AA football schools, and 150 Division II football schools.There are more than 60 "1-A" games a week because not all of the games pit two 1-A schools against each other.As an example, the start of the 2009 season saw the University of Virginia, a 1-A football school, play William and Mary, a 1-AA football school. Temple, a 1-A football school, played Villanova, a 1-AA football school. Duke, a 1-A football school, played University of Richmond, a 1-AA football school.