Which statement about tobacco use is true? a. smokeless tobacco can lead to cancer but is not addictive. b. smoking relaxes people because it lowers the heart rate. c. smoking can lead to emphysema as well as strokes.

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As you sit in the library with your friend studying for your weekly quiz on the integumentary system, you come upon an article about the hazards of prolonged exposure to the sun's rays. your curious nature leads you to research the subject further. you're fascinated to learn that minimal exposure to the sun allows you skin to manufacture vitamin d, which is important to maintain homeostasis. you also read that although sunscreen can protect you from the ultraviolet (uv) rays of the sun, some medications can actually increase a person's sensitivity to the sunlight.

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