本题目来源于试卷: Unity and Diversity A.8 Evolution and Speciation，类别为 IB生物学
[单选题]
The diagram below shows li7bsmxhp7997 j0l hz the feeding areas of four species of warbler (genus S k2l-z1 f oivu ./bgq-aetophaga). What is the best e f--qo l /kz gb.u12aivxplanation for how these warblers came to coexist in such close proximity?
A. Polyploidy resulted from multiple sympatric speciation events.
B. Adaptive radiation reduced competition between the species.
C. The presence of four species increases biodiversity and ecological stability.
D. One species evolved over time to exploit new ecological niches.
参考答案: B
本题详细解析:
Choice B is correct because adaptive radiation involves exploiting new ecological niches and speciation, here resulting in 4 new species from the original ancestral species which compete less with one another. Choice A is incorrect, as polyploidy is rare in vertebrates and animals generally. Although greater biodiversity generally increases ecological stability, Choice C does not explain how the warblers came to coexist in such close proximity. Choice D is incorrect because if only one species evolved to exploit new ecological niches, there would be only one warbler species, not four.
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