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CO₂ is roughly a few hundredths of a percent (~0.04%).
Hence the keyed answer is 0.03 to 0.04% CO2.
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Water's triple point is defined at 273.16 K.
Hence the keyed answer is 273.16 K.
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Hydrogen has the highest calorific value per unit mass among common fuels.
Hence the keyed answer is Hydrogen.
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Helium is the lightest noble gas.
So the correct answer is Helium.
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Mediterranean climates have dry summers and wet winters.
So the correct answer is Mediterranean type.
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Bamboo is a type of grass.
So the correct answer is Grass.
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