Hibernation is when animals rest or remain asleep during the entire winter. Animals do this because, in the winter, they cannot find enough food. Migration is the movement of animals from one place to another to escape the cold weather and to seek food. Once the season changes, the animals return.
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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.