Coordinating conjunctions join two ideas that are equally important and could be independent from each other.
I had a peanut butter and jelly sandwich for lunch.
We use “but” to show contrast in a sentence.
Lisa plays basketball but not baseball.
We use “so” to identify a cause and effect relationship in a sentence.
Lisa plays basketball, so she is busy during the winter months.
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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.