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癌细胞让我们演化出了性行为？
source link: http://tech.sina.com.cn/d/f/2019-06-21/doc-ihytcerk8298844.shtml
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来源：环球科学绝大部分生物，从袖珍的昆虫到庞大的鲸，都需要通过性行为来繁衍后代。但这种看似理所应当的行为，却成为了困扰生物学家一百多年的问题。有性繁殖的存在意义是什么？性行为需要消耗大量的能量，甚至威胁生存，但为什么超过99%的真核生物都选
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