11.   Every behavior has a cause.

12.   Hardly, because such behavior only would have served to exacerbate the long-standing bitterness that has existed between them.

13.   His erratic behavior has baffled Belichick and his predecessors, Bill Parcells and Pete Carroll, and some believe it has prevented Glenn from reaching his prodigious potential.

14.   If the behavior has a physical cause, it must be corrected before any behavioral treatment can be effective.

15.   I think we can all agree that abusive behavior has no place in youth sports.

16.   Jim Broatch, executive director of the Obsessive-Compulsive Foundation in Milford, Conn., says obsessive-compulsive behavior likely has a genetic component.

17.   Ms. Smith says that she wonders if Clinton, himself, understands the negative impact his behavior may have had on children.

18.   Most of all, he conceded that his behavior had to change.

19.   Nor does saying that a behavior may have a biological substrate mean the behavior is immutable, inevitable or mechanical.

20.   Of course, this particular behavior has little to do with love.