What did kikunae ikeda discover, and how did it change the way taste is perceived almost a hundred years later? you do not need the audio to answer the question

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

First to answer will be the brainliest i need the answer asap

Describe how the immune system protects the body from the threat of disease. (minimum 5 sentences per paragraph)