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ZERAMAEBORROMEO17IN
Answered

1.) It is used to generate and transmit EM waves

2.) the visible or invisible radiation emitted by certain substance as a result of incident radiation

3.) obstruct

4.) turns the wheel
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Sagot :

AMONGUS1234IN

Answer:

1. Electromagnetic waves

2.RADIATION

3. Block or close up by an obstacle A piece of food obstructed his airway.

4. If you say that the wheels turn in a process or situation, you mean that progress is made.