Which of the following is not true concerning warm-up exercises?
a. they should be low-intensity.
b. they should get progressively more intense.
c. they should last 20 to 30 minutes.
d. they should increase heart rate, breathing, and temperature.

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