A living thing is something that is alive and active. Plants and animals are living things. They need food, water, and air. They also reproduce, grow, and move. Nonliving things do not need food, water, and air. They cannot reproduce, grow, or move. Nonliving things do not respond to change. Living things do respond to change.
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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.