帮忙分析下面的句子,我知道compared作过去分词,请麻烦还原一下compare这个句子
Thegrandmediocrityoftoday—everyonebeingthesameinsurvivalandnumberofoffspring—meansthatnaturalselectionhaslost80%ofitspowerinupper middle classIndiacomparedtothetribes.
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