They’re the teams within the team — those cohesive little units bound together by their shared responsibilities within the larger team context. 

The start of the 2012 college football season is just a few weeks away. However, as fall practice kicks off around the nation, plenty of unanswered questions remain, including some that will have an impact on the national title race. Athlon preps you for everything you need to know about fall practice with the 20 biggest storylines to watch over the next couple of weeks.

As usual, the Big Ten should produce plenty of elite defensive talent this season. Ohio State's John Simon and Michigan State's William Gholston should be two of the top defensive ends in college football, while Purdue's Kawann Short should be a household name by the end of the year. The offensive side of the ball isn't bad, but the conference lost several key offensive linemen and receivers. 

Kickoff for the 2012 college football season is just around the corner. However, plenty of unanswered questions remain around the nation for every team. Injuries, quarterback battles and players that need to step up to make a run at the conference title will all be under the spotlight over the next couple of weeks. 

The Big Ten's 10 Biggest Storylines to Watch in Fall Practice

Predicting college football's national champion is never an easy task. In addition to combing through schedules, returning starters, players lost and statistics, there are several factors impossible to account for. Injuries and luck will have a major impact on the 2012 season - and neither can be projected. 

Kickoff for the 2012 college football season is still two months away, but it's never too early to project how the year might play out. Athlon will be taking a look at how each position stacks up in the BCS conferences and nationally until the start of the season.

Each unit ranking was evaluated based upon how it will perform in 2012 - not how the team played in 2011.

Kickoff for the 2012 college football season is still two months away, but it's never too early to project how the year might play out. Athlon will be taking a look at how each position stacks up in the BCS conferences and nationally until the start of the season.

Each unit ranking was evaluated based upon how it will perform in 2012 - not how the team played in 2011.

Kickoff for the 2012 college football season is still two months away, but it's never too early to project how the year might play out. Athlon will be taking a look at how each position stacks up in the BCS conferences and nationally until the start of the season.

Each unit ranking was evaluated based upon how it will perform in 2012 - not how the team played in 2011.

Kickoff for the 2012 college football season is still two months away, but it's never too early to project how the year might play out. Athlon will be taking a look at how each position stacks up in the BCS conferences and nationally until the start of the season.

Each unit ranking was evaluated based upon how it will perform in 2012 - not how the team played in 2011.

College football expansion has taken over the hearts and minds of college football junkies everywhere.

The sky is falling, rivalries are dead and the future of college football is in great peril. I am here to tell you that this just simply isn’t the case. Conference realignment has been taking place for more than a century and it won’t stop anytime soon. Teams have been switching leagues, conferences have been created out of thin air and college football has powered through all the criticism and into the playoff era.