How will batting practice affect a player's batting average?

The more you practice, the better you become, so it will improve a player's batting average.

Batting average is the performance of the batter. This is expressed as the ratio of the batter's safe hits per official times at bats. I would say that battling practice would improve the player's performance because he will be better accustomed to the position he is most comfortable.  

1.controls blood flow2.controls oxygen flow3.carries oxygen rich blood to veins

What? are u trying to do a genetic test?