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Infrared radiations are primarily used to

a. heat food in ovens
b. transmit cellular phone signals
c. image people's bones and teeth
d. detect the location of objects that emit heat

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pmayl
The best answer is 
A) heat food in ovens

Microwaves harness infrared radiation to heat foods. It is especially effective at heating up water molecules, which basically all food contains. 

Answer:

A. heat food in ovens

Explanation:

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