Question

select the dependent clause.
frozen foods may lose water molecules and become dehydrated unless they are wrapped tightly.
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Explanation:

A dependent clause cannot stand alone as a complete sentence, relies on an independent clause for meaning, and often starts with a subordinating conjunction like "unless". In the given sentence, the independent clause is "Frozen foods may lose water molecules and become dehydrated", while the clause starting with "unless" depends on it to make full sense.

Answer:

unless they are wrapped tightly