Certain types of feline leukemia can cause rapid and substantial weight loss in large cats  The lion in City Zoo has clearly lost a tremendous amount of weight in recent weeks
Ttherefore, the lion in City Zoo definitely has feline leukemia
Using the wrong grade of gasoline in a car can cause a marked decrease in mileage. Melinda has noticed a dramatic decrease in the distance that she can drive on a full tank of gasoline. Ttherefore, Melinda has clearly filled her tank with the wrong grade of gasoline.