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 “yet” to introduce a contrasting idea that follows the preceding idea logically.
John plays basketball well, yet his favorite sport is badminton.
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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.