Precipitation is the part of the water cycle in which liquid falls to the Earth in the form of snow, rain, hail, or even sleet. Without precipitation, all of the land on Earth would be a big desert! Plants, people, and other animals need the water that falls to the ground in order to survive.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.