A. between 20 hertz and 1000 hertz
B. between 1000 hertz and 20000 hertz
C. less than 20 hertz
D. more than 20 kilohertz
Submitted by: Habib Baloch
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B. Heat waves
C. Gravitational waves
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B. Oceans
C. Wind
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B. Stratosphere
C. Ozone layer
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A. 0.05 seconds
B. 0.06 seconds
C. 0.07 seconds
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A. Acoustics
B. Paleontology
C. Mineralogy
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A. Donkey
B. Monkey
C. Humpback whales
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A. Five
B. Six
C. Seven
D. FourSubmitted by: Muhammad Danish
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A. 45
B. 51
C. 50
D. 60Submitted by: Warraich
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B. Arctic Ocean
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