A simple sentence consists of a single independent clause and expresses a single complete thought.
I will spend my whole vacation in Spain.
A compound sentence is made from two independent sentences that make sense on their own, are short and are combined by a connector.
My house is white and it has green shutters.
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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.