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Author Question: Which of the following best explains the growth in output per worker hour during the 20th century? (Read 31 times) |
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.