The intensity of an activity refers to the
a. length of time it takes for an exercise or group of exercises to be complete.
b. number of times an exercise or group of exercises is performed within an certain time frame.
c. amount of energy exerted while performing an exercise.
d. classification of exercise.

Hiv is inactivated in the laboratory after a few minutes of sitting at room temperature, but the flu virus is still active after sitting for several hours. what are the practical consequences of these findings? a) hiv can be transmitted more easily from person to person than the flu virusb) the flu virus can be transmitted more easily from person to person than hivc) this property of hiv makes it more likely to be a pandemic than the flu virusd) disinfecting surfaces is more important to reduce the spread of hiv than the flu