Arif has recently quit smoking. What benefit can he expect to occur within a few hours of quitting? O blood oxygen levels returned to normal
O risk of heart disease cut in half
O improved liver health
O reduced coughing and congestion

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the dependent variable in galileo's experiment?