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Internal body pressure balances external air pressure — an equal and opposite pressure from inside.
So the correct answer is An equal and opposite pressure acts from inside.
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Typical adult male brain mass is about 1350 g.
So the correct answer is 1350 gr.
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According to the keyed answer, sound is slowest in vacuum.
Editor note: sound needs a medium; options left unchanged.
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According to the keyed figure, it is about 25640 light-years.
Editor note: published estimates vary slightly; options left unchanged.
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Chronic smoking commonly causes emphysema (COPD).
Hence the keyed answer is Emphysema.
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Raised water stores potential energy.
Hence the keyed answer is Potential energy.
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