John was studying plant varieties in different regions. He fist visited the Pacific Northwest. He found that the wind was constantly very strong there. He marked it as case A. Then he studied the plants in the Midwest. He found that on average the wind speed was very light there. He marked it as case B. Would the tree line be lower or higher in case A than in case B?
Ans: lower

Two engineering students learned about petroleum products, While Dan learned more about plastics, Jim learned about fuels. Which student learned more about fuels for trucks?
Ans: Jim

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?
Ans: Paul

Two groups of students went on a field trip. Group Scouts visited a bee farm, while group Bears went to a salmon hatchery. Group Scouts had children experiencing mild allergic reactions, while one student had severe allergic reactions to a bee sting. Which group had fewer students experiencing difficulty breathing?
Ans: Bears