device - an invention designed to solve a problem, distance - how far something has to travel; if it is long it's far and if it is short it's close, one way communication - when information is transferred in one direction only; like watching TV, reading a book or blowing a whistle, two way communication - when information is transferred back and forth; like talking with a friend, asking your teacher a question or making a phone call, communicate - to send a message to someone else, signals or code - special sounds people use to send a message or tell others what to do, often from far away,

Match-up Sound Communication

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