Q: Unburned hydrocarbons can more easily be converted to carbon dioxide and water in the presence of a what? Choices: - temperature - methane - Ethanol - catalyst A:
catalyst
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Q: Unlike energy, what doesn't need to be constantly added to ecosystems because it is recycled through ecosystems? Choices: - water - nutrients - vapor - matter A:
matter
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Q: What dangerous oxygen compound is found in ground level smog? Choices: - argon - sulfur dioxide - neon - ozone A:
ozone
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Q: What type of fatty acids have bent chains? Choices: - cholesterol - saturated fatty acids - lipids - unsaturated fatty acids A:
unsaturated fatty acids
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