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A single mutation is unlikely to result in cancer. Cancer is usually caused by a series of mutations that accumulate throughout the course of a person's life. As a result, cancer is more common in older adults. They've seen more chances for mutations to accumulate.
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i would write about a well economically developed country like " USA, China, Japan or Germany" Vs a badly developed country like "Fiji , Peru , South Africa" its easy to research these places :)
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good luck champ
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hardness and luster
Minerals are classified by many different things - but the two speical and primary propertied that identify them are hardness and luster.
Hope it helps!