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     EduGorilla 
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    Dogs are used for detective work by the police because they –

    Options :-

    1. can hear ultrasonic waves of frequency upto 5,00,000 Hz
    2. can hear infrasonic waves
    3. can hear utlrasonic waves of frequency upto 1,20000 Hz
    4. can hear sound waves of frequency in the range 20 Hz to 20,000 Hz
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