Sometimes one subject may be doing more than one thing. There may be more than one verb and these are called compound predicates.
Betty walks along the ocean and admires the waves.
Betty is the one subject, but she is doing two things; walking and admiring. So, “walks” and “admires” together form a compound predicate.
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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.