None of them. The AFC has 4 divisions of 4 teams each and the NFC has 4 divisions of 4 teams each.
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In volleyball, there are cyo teams and club (travel) teams. Club teams are divided into age divisions. The 12s division would be that of players twelve years and under.
There are now 30 NBA teams. There are two conferences with 15 teams each. There are five in each of three divisions within each conference.
Because there were too many teams to all be in one division.
http://espn.go.com/mens-college-basketball/teams ... It's a list of all College Teams of all divisions
Patriots and the dolphins
32 total teams in 8 divisions. NFC north south east and west AFC north south east and west
There are 4 divisions in each conference. East, North, South, and West. Each has 4 teams. There are 2 conferences NFC and AFC for a total of 32 teams.