That depends on the league. Many leagues will allow substitutes, while some will only allow pacers1 and others won't allow any sort of substitution at all.
This can depend on the league rules. Many teams have extra roster members to either rotate who bowls each week or to have extras in case of an unforseen or planned absence. Many leagues do allow a member of a team to substitute on a different team, providing they are not substituting for a team who is going to be their opponent.
A bowler is not permitted to cross the foul line.
The anchor bowler
yes
No. The same bowler must continue the bowling.
No it just as your bowler's ID number on it.
Sean rash in the PBA
Yes
about 227 per game
A bowling enthusiast is called a "kegler."
With the advent of better, lighter bowling balls, there isn't a set average. A lot depends on the ability of the bowler and skills of the bowler.
MIB stands for most improved bowler.
If you are a professional bowler, then yes.