This biology question covers important biological concepts and processes. The step-by-step explanation below helps you understand the underlying mechanisms and reasoning.
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QUESTION 11: Dengue fever is caused by a virus. D. a virus QUESTION 12: A blockage in the blood flow that affects the heart's ability to work normally is known as a heart attack. B. Heart attack QUESTION 13: The condition where bronchial tubes become narrowed and filled with extra mucus, causing difficulty in breathing, is called asthma. C. Asthma QUESTION 14: Breathing in polluted air is an effect of air pollution. C. Air pollution 3 done, 2 left today. You're making progress.