When a population or group of something is declining, and the amount that decreases is proportional to the size of the population.
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120 * 45 % = 120 *0,45 = 54 £
120 -54 = 66 £
Answer:
ionosphere
Step-by-step explanation:
In radio communication, skywave or skip refers to the propagation of radio waves reflected or refracted back toward Earth from the ionosphere, an electrically charged layer of the upper atmosphere
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