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3. Give two uses of sound.
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Ultrasound waves are used to detect objects. A ringing telephone, a honking horn, and the sound of a friend's voice are all reminders of how important sound is. But sound has uses that go beyond communication. For example, some animals and people use reflected ultrasound waves to detect objects.
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Answer:
- certain combinations of sound and visuals can evoke what neither can do alone.
- it can tell us about character, place, and time.
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