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According to the keyed exam answer, the South Pacific is least polluted.
Editor note: rankings vary by metric; options left unchanged.
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Electric power is measured with a wattmeter.
So the correct answer is Wattmeter.
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Energy pyramids are always upright.
So the correct answer is Always upright.
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According to the keyed answer, female frogs have no larynx.
Editor note: claim is scientifically weak; options left unchanged.
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Rayon is often called artificial silk.
So the correct answer is Rayon.
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