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Author Question: Which of the following statements is true? (Read 30 times) |
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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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The average adult has about 21 square feet of skin.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.