Fossils are the remains of plants and animals that lived a long time ago. Fossils can tell scientists about how an animal lived or about a plant’s life. Many fossils are the remains of plants and animals that are extinct.
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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.