A teacher wanted to increase class participation, so she positively reinforced students who asked questions by giving them nickels. After a few days, students had stacks of nickels on their desks and were asking far too many questions. To reduce question asking, the teacher could remove a nickel whenever students asked a question, a process known as . Or, she could simply stop giving students nickels when they asked questions, a process known as .

Read the paragraph and answer the question that follows: the town of belmond, iowa, needs to add weather sirens. the loud and steady wail would warn citizens of approaching danger. if past history is an indication, the sirens will save hundreds of lives. with a prediction of a deadly storm season, the alert which sentence should be revised to eliminate redundancy? the town of belmond, iowa, needs to add weather sirens. the loud and steady wail would warn citizens of approaching danger. if past history is an indication, the sirens will save hundreds of lives. with a prediction of a deadly storm season, the alert system is needed immediately.