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【单选题】
以下有关性选择的描述，正确的是
A.
自然界中能留下更多后代的个体，并不一定靠体格强壮
B.
生物之间的性选择和自然选择一样激烈
C.
成年鸟种群内存在的不同，只与个体差异有关，与性选择无关
D.
被性选择的个体生存能力更强
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