The ability of a plant to live in hot, dry or cold areas is called adaptation. Plants develop adaptations that help them live and grow in different areas. Plants have to survive in hot or cold areas, and wet or dry areas. They develop different ways to keep water in if it is hot. If they need protection from animals, the plants may have thorns or spikes. Some plants could not live in a different kind of area. They are made for just one type of area.
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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.