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Paleontologist Stephen Jay Gould has argued that many biological traits are not the products of

natural selection, favored due to their enhancement of reproduction or survival, but that they are

simply random by-products of other evolutionary developments.

(C) because they enhance reproduction or survival, but

(D) because they enhance reproduction or survival, but are

这个题我们可不可以想成不是not,but的平行，而只是but两侧的平行，即not是左侧平行内容的一部分？？