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Maintaining a healthy weight allows the respiratory system to work more effectively because a. oxygen is being delivered more adequately. b. the heart does not have to pump as forcefully. c. the capillaries are constricted. d. the lung capacity allows for small amounts of air.
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The age of receding pandemics is one of three progessive ages of epidemiologic transition. select one: true false
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Low levels during pregnancy can cause long labor and small babies...
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