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Find the error with subject-verb agreement. Select the incorrect verb and type it correctly. When you inhale the diaphragm a muscle beneath the lungs flatten out to make way for the air entering your lungs

Answer :

Answer:

When you inhale the diaphragm a muscle beneath the lungs flattens out to make way for the air entering your lungs

Explanation:

Since the subject in this sentence which is the diaphragm is a singular noun, the verb flatten should become flattens in order to agree the subject to the verb.

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