Which is a true statement about nicotine?
a. nicotine users do not have a physical need for the substance.
b. smokers experience little or no nicotine withdrawal when they quit.
c. nicotine addiction can prevent diseases.
d. nicotine is as addictive as alcohol, cocaine, or heroin.

Mason joined the water polo team at his school. as part of his conditioning, mason's coach requires a 25-minute run during practice. mason's heart rate reaches 125 beats per minute, but his target heart rate zone is 138—183 beats per minute. what should mason do to get the most benefit for his heart? increase the amount of time he runs increase the speed at which he runs decrease the amount of time he runs decrease the speed at which he runs