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What can’t talk but will reply when spoken to?
pls my teacher said i can get a homework pass if i get this right in 5 mins
An echo is a natural phenomenon when sound reflects back to the listener with a delay after the actual sound time. When we shout and then we could hear the same sound back, that is called the echo. So it doesn't come without one making a sound. So it is only a reply and can not initiate sound production first.
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