Dr. austin is studying the effects of aging on memory. she gives a test of memory to a group of 20-year-olds, a group of 30-year-olds, and a group of 40-year-olds. then she examines the data for significant differences between the age groups. which research design is dr. austin using?

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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

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