A predicate is what is being said about the subject in a sentence. In other words, it describes what is happening.
Sandra draws a picture.
Here, draws a picture is the predicate. That is what is happening in 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.