A complete sentence always contains a subject and a predicate.
A subject (a noun or a pronoun with modifiers) tells who or what the sentence is about.
A predicate, such as a verb, tells what happens or what the subject is doing.
The verb, (what is happening), makes up the predicate of the sentence.
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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.