The job, or function, of a word is what gives the label for its part of speech. English has eight parts of speech which are:
Interjections are words that are used to express strong emotions or feelings. They are exclamations like Oh!, Ouch!, or Well.
Ouch! I hit my head on the door.
Well, Greg might want to go with us.
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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.