If the disease is communicable, it is contagious. If it is airborne, it is transferred through the air, as opposed to physical touch or blood-borne. Being in a confined space, such as an ambulance, with an airborne communicable disease means you have most definitely been exposed to it.
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Answer:
<em><u>It </u></em><em><u>is </u></em><em><u>the </u></em><em><u>statical </u></em><em><u>study </u></em><em><u>of </u></em><em><u>human </u></em><em><u>population</u></em>