People with diabetes often receive insulin injections. What effect does insulin have on the body? A. It raises blood-sugar levels. B. It lowers blood-sugar levels. C. It raises glucagon levels. D. It lowers glucagon levels.

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Insulin injection is used to control blood sugar in people who have type 1 diabetes(condition in which the body does not make insulin and therefore cannot control the amount of sugar in the blood) or in people who have type 2 diabetes (condition in which the blood sugar is too high because the body does not produce 

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