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The daily temperature swings on the surface of Mars (as measured by the Mars Rover) is 80-90 C°--if the daytime high is 20°C, the nighttime low is around -65°C. We don't have such wide daily fluctuation here on Earth. Which of the following best explains our comparatively stable surface temperatures?
a. The forested areas on the earth's surface cause cooling during the day, while the deserts release a lot of heat after the sun goes down.
b. The earth is covered with a whole lot of water, which absorbs heat energy during the day and releases it at night.
c. The earth contains many more nonpolar molecules than Mars, due to the abundance of life.
d. The earth is much closer to the sun, and this acts as a stabilizing force for maintaining temperature.
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