The marine biologists studied two areas of the Black Sea. Area A, situated at the mouth of the Danube River, which presented high levels of water stratification, because of the fresh water discharged by the river; and area B, situated 35 miles south, where the water was less stratified and more oxygenated. Which of the two areas had less dense water?
Ans: Area A

David works for the government as a statistician. He had to produce a report for the coming annual meeting. This year he is thinking about a report with some lifestyle suggestions for middle adulthood population. To make it easier to understand the needs of middle adulthood population he would compare it with a group who are in their twenties. He labeled the first group as group A; and the latter group as group B. Would group B more likely or less likely be diagnosed with cancer than group A?
Ans: less likely

Two sisters took their blood pressure at the doctor's office. Jill had hypertension, while her sister Beth had normal blood pressure. Which sister has to make diet changes?
Ans: Jill

Adam wants to show his little brother a trick. He gets a bucket of water and says to him "I bet i can turn this bucket upside down and no water will fall out". His brother doesn't believe him of course. So Adam takes the bucket by the handle and quickly starts spinning it in a circle. Will the centripetal force on the bucket increase or decrease as Adam spins it faster?
Ans: increase