y is the sentence incorrect

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by sl750 » Thu Jul 07, 2011 9:21 am
This sentence has a misplaced modifier

The phrase 'by the twelfth week of pregnancy' is not modifying fetal heartbeats instead it should modify the noun 'Physician'

So it should read as follows

By the twelfth week of pregnancy, a physician can detect fetal heartbeats using a Doppler ultrasound device

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