Several groups of researchers were conducting experiments to study how exercise affects cholesterol levels. One group had college students run two miles a day for six weeks. Another group had senior citizens participate in gentle water aerobics twice a week for a year. Cholesterol levels dropped slightly among the college students but dropped significantly among the senior citizens. Based on these results, what should the researchers plan to do next to validate the findings?

Design more studies testing the effect of duration and intensity of exercise on cholesterol levels in different age groups.

Explanation:

A sponge that is 4 inches (10 centimeters) tall and 0.4 inch (1 centimeter) in diameter pumps about 23 quarts (22.5 liter) of water through its body in one day. To obtain enough food to grow by 3 ounces (100 gram), a sponge must filter about 275 gallons (1,000 kilograms) of seawater.

Explanation:

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