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.
Subordinating conjunctions establish relationships between two ideas and always come at the beginning of a subordinate or dependent clause.
This car is much larger than the one we used to have.
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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.