A phrase to describe a negative feedback loop could be: self-regulating (though I'm not sure the exact word you're looking for).
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In the 1800s the leading cause of death was dysentery and in the early 1900s the leading cause of death was Tuberculosis, diarrhea and enteritis
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Actually the answer is applying sunscreen. Since noncommunicable means not transmitted from living beings.
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On another note, the answer below is both false as an answer and as a general piece of knowledge. Depression is NOT something you can will away or avoid by having a "positive attitude". It is an in-balance in the chemicals in the brain that sometimes needs professional medical and psychological help. And it is nothing to be ashamed of.
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Besides solar fluctuations, the amount of radiation is also affected by small particles called aerosols. The more aerosols are present in the atmosphere, the less solar radiation reaches the Earth. Large quantities of aerosols actually help to cool down the Earth and to temper ('dim') the greenhouse effect.
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<span>d. tarnishing is a chemical change. </span>
