Next time you are thirsty, try drinking a glass of water instead of a soda. Although both will quench your thirst, soda is full of sugar and chemicals. Water, on the other hand, is a much healthier choice. Water helps your digestive system to function properly and keeps you immune system strong so you won't get sick. Which key words tell you this is organized as compare contrast?
water instead of soda
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is a much healthier choice