Aveoli are the small sacks in the lungs, where gases such as oxygen and carbon dioxide are transferred into/out of the blood stream. Blood would be the answer, as blood is not transferred through alveoli; it stays in blood vessels and is oxygenated at the alveoli.
<em>The answer is epidemic</em>
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If this is multiple choice then I am sorry this is not the answer you are looking for but all of these substances are in breast milk.
Answer:
A calorie is a unit of energy.
"In human nutrition, the term empty calories applies to foods and beverages composed primarily or solely of sugar, fats or oils, or alcohol-containing beverages. These supply food energy but little to no other nutrition in the way of vitamins, minerals, protein, fiber, or essential fatty acids."- Wikipedia