Prohibition of hunting of waterfowl is easier to enforce in areas under cultivation than in wild lands.

　　 Most geese and swans nest and breed farther north than ducks do, in areas that still are not cultivated.

　　 Land that has been harvested rarely provides food suitable for waterfowl.

　　 Goose and swan populations decline in periods of drought, when breeding sites are fewer.

　　 Because they are larger than ducks, geese and swans have a harder time finding protected nesting sites in areas that are cultivated.

　　10. A researcher found that, in proportion to their body weights, children eat more carbohydrates than adults do. Children also exercise more than adults do. The researcher hypothesized that carbohydrate consumption varies in direct proportion to the calorie demands associated with different levels of exercise. Which of the following, if true, most seriously undermines the researchers hypothesis?

　　 More carbohydrates are eaten per capita in nations where the government spends more per capita on public exercise programs.

　　 Children who do not participate in organized sports tend to eat fewer carbohydrates than children who participate in organized sports.

　　 Consumption of increased amounts of carbohydrates is a popular tactic of runners preparing for long-distance races.

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