Why do acids not show acidic behavior in the absence of water?A light-year is a measurement of distance and not time (as the name might suggest). A light-year is the distance a beam of light travels in a single Earth year, or 6 trillion miles (9.7 trillion kilometers). On the scale of the universe, measuring distances in miles or kilometers doesn't cut it
The answer is A, The greenhouse effect is changing Earth's atmosphere.
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