Cervical cancer is caused by severe abnormal changes in the cells of the cervix. Most precancerous or cancerous cell changes occur in the cervix at the transformation zone, because these cells normally undergo constant change.
A balk in baseball is any action by the pitcher that violates the balk rule, which restricts the actions of the pitcher when there is at least one runner on base. The purpose of the balk rule is to protect the runner or runners from being deceived by the pitcher.
A bat is a stick used by the batter to hit the baseball. Baseball bats were traditionally made from ash, though other hardwoods have been used. Hollow metal (such as aluminum) and composite bats are now standard in most amateur baseball and some professional leagues outside of North America.