43. 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. A due to their enhancement of reproduction or survival, but that they are B due to the reproduction or survival they enhance, but they are C because they enhance reproduction or survival, but D because they enhance reproduction or survival, but are E because of enhancing reproduction or survival, but are
我觉得应该是not...but...的对称结构。可是给出的答案是 D,请高人指点 |