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Using Smartphones,one Can Watch the News,shoot Videos,browse the Internet,take Pictures,and

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Using smartphones,one can watch the news,shoot videos,browse the Internet,take pictures,and listen to music.Improved features are added with each smartphone introduced by Apple,Samsung,LG,and others.As a result,customers often want to replace their existing smartphones with new models or brands every two years when their contracts expire.This increase in demand is due mostly to changes in ________,an environmental force.


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