Prep2012-Pack1-CR-004 Vcr07638 Easy
Increases in the level of high-density lipoprotein (HDL) in the human bloodstream lower bloodstream cholesterol levels by increasing the body's capacity to rid itself of excess cholesterol. Levels of HDL in the bloodstream of some individuals are significantly increased by a program of regular exercise and weight reduction.
Which of the following can be correctly inferred from the statements above?
A. Individuals who are underweight do not run any risk of developing high levels of cholesterol in the bloodstream.
B. Individuals who do not exercise regularly have a high risk of developing high levels of cholesterol in the bloodstream late in life.
C. Exercise and weight reduction are the most effective methods of lowering bloodstream cholesterol levels in humans.
D. A program of regular exercise and weight reduction lowers cholesterol levels in the bloodstream of some individuals.
E. Only regular exercise is necessary to decrease cholesterol levels in the bloodstream of individuals of average
Prep2012-Pack1-CR-005 VCR07639 Easy
In Asia, where palm trees are non-native, the trees' flowers have traditionally been pollinated by hand, which has kept palm fruit productivity unnaturally low. When weevils known to be efficient pollinators of palm flowers were introduced into Asia in 1980, palm fruit productivity increased— by up to 50 percent in some areas—but then decreased sharply in 1984.
Which of the following statements, if true, would best explain the 1984 decrease in productivity?
A. Prices for palm fruit fell between 1980 and 1984 following the rise in production and a concurrent fall in demand.
B. Imported trees are often more productive than native trees because the imported ones have left behind their pests and diseases in their native lands.
C. Rapid increases in productivity tend to deplete trees of nutrients needed for the development of the fruit-producing female flowers.
D. weevil population in Asia remained at approximately the same level between 1980 and 1984.
E. Prior to 1980 another species of insect pollinated the Asian palm trees, but not as efficiently as the species of weevil that was introduced in 1980.
