There are two neighboring planets in another solar system. The people of Mandron use many fossil fuels to power things that require electricity. The people of Liptar have found a way to use water as a source of power and they barely use any fossil fuels at all. Does Liptar send more or less gas into the atmosphere than Mandron?
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Answer: less

David is experimenting with electromagnetic waves. He has four different waves to study, wave A, wave B, wave C, and wave D. In wave A, distance between two corresponding points on adjacent waves is greater than that of wave B. In wave C, the number of waves that pass a fixed point in a given time is greater than that of wave D. Which wave has lower frequency, wave C or wave D?
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Answer: wave D

Mark works as a scientist for a molecular research institute. Today, he has three samples of molecule in front of him, sample A, sample B, and sample C. Sample A is a straight-chain molecule; sample B is a branched-chain molecule; and sample C is a cyclic molecule. Mark's job is to determine the characteristics of each sample. Would sample C have higher or lower boiling point than sample B?
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Answer:
higher