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One half-life reduces amount by half, so 8 days.
So the correct answer is 8 days.
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According to the keyed exam answer, humpback whales produce the loudest sound.
Editor note: blue whales often top loudness rankings; options left unchanged.
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According to the keyed answer, the gallbladder is in the liver.
Editor note: location wording is imprecise; options left unchanged.
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Surface waves usually cause the greatest damage.
So the correct answer is Surface waves.
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Walter Hunt invented the safety pin (1849).
So the correct answer is Walter Hunt.
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Phonetics is the study of speech sounds.
So the correct answer is Study of speech sounds.
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