Some people prefer interval training because a. they can exercise at a steady, but slow, pace for longer periods of time. b. it's performed with speed and may not cause boredom. c. the intensity of the exercise doesn't increase, only the time does. d. they've found that this type of training is best for beginners.

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