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Author Question: Permitting the exchange of nutrients and gases between the blood and tissue cells is the primary ... (Read 61 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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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.