Each part of a plant helps the plant survive and reproduce. The flower helps attract insects and birds. The leaves make the food for the plant. The roots hold the plant in the soil. They also take in the water and minerals. The stem carries the water to different parts of the plant. It also holds the parts of the plant up.
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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.