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搜题
【单选题】
At birth, each human’s genome contains approximately ____ new mutations that were not present in the genomes of either parent. Combined with the jumbled collection of ancient variation we acquired from our ancestors, these recent mutations further distinguish one individual from another.A.
50
B.
70
C.
90
D.
120
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知识点：
皮皮学刷刷变学霸
举一反三
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