The One Great Season College Football Countdown continues Friday. We'll be counting down the preseason Top 25 teams in 2010. Today's article features No. 21 North Carolina.

Continuity. Consistency. Experience. Whatever you want to call it, North Carolina's got it in 2010.

At least on defense.

That's where six NFL-ready players return from a stellar unit that was among the nation's best in 2009. A total of nine defensive starters return and are expected to dominate the ACC and again be one of the finest in the country.

But there are questions about the offense, particularly quarterback T.J. Yates. He'll be starting ...

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