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Look at the text below. If there is an error with subject-verb agreement, select the incorrect verb and type it correctly. Otherwise, submit the text without making any changes. The Doppler effect results from the fact that as a moving object approaches an observer the apparent frequency of its sound waves increase

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Answer:

The Doppler effect results from the fact that as a moving object approaches an observer, the apparent frequency of its sound waves increases.

Explanation:

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