Ques:Q: What is water falling from the sky called? Choices: - snow - temperature - acid - precipitation A:

Ans:precipitation
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Ques:Q: What waves do radio and television use? Choices: - sound waves - light waves - gamma waves - radio waves A:

Ans:radio waves
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Ques:Q: What is the main function of the cardiovascular system? Choices: - respiration of air - excretion of food waste - coordinate bones and muscles - transporting substances around the body A:

Ans:transporting substances around the body
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Ques:Q: What is the name of the mechanism in which sounds are encoded in microwaves by changing their frequency? Choices: - molecular modulation - shape modulation - mechanical modulation - frequency modulation A:

Ans:
frequency modulation
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