Problem: Dean and Paul both went to volunteered in Africa. They had a blood test when they came back. Paul had been infected with the HIV virus while Dean was healthy and clean. Which friend has a virus that is transmitted by sexual contact?

A: Paul

Problem: The doctors studied two groups of people, group one which included people with respiratory diseases caused by viruses, and group two, which had people with respiratory diseases caused by bacteria. Which group didn't include people that had tuberculosis?

A: group one

Problem: Mark and Jerry are brothers. Mark just got done working out and returned home to find his brother laying down on the couch eating a bag of potato chips. Mark comments that Jerry should really come and work out with him some time. Jerry brushes him aside. Which person's body has less lactic acid?

A: Jerry

Problem: Jim had a small veggie garden that he planted every year. His brother Rob had a similar patch, and he was also a gardener. The plants in Jim's garden started wilting at some point and he found out that his soil had high salinity and some harmful bacteria that wiled the plants indirectly. Rob's plant were ok, because he adjusted the soil's ph with sweet lime. Which garden soil had lower salinity?

A:
Rob's