本题目来源于试卷: Unity and Diversity A.9 Conservation of Biodiversity，类别为 IB生物学
[单选题]
Which provides evidence for a higher level of bi;+dfe q/frw p ub61k.zodiversity now compare yx 3nt,iwu5- j9:ybxdd to any timytiuw9,x yj:b - 3n5dxe in the past?
A. Changing levels of atmospheric carbon dioxide
B. The fossil record
C. A decrease in the rate of evolution
D. Decreased levels of speciation
参考答案: B
本题详细解析:
The number of organisms found viabqll ;::)n fqx the fossil record for any era is much lower compared to the number of organisms found on Earth now and those that continue to be found, so Choice B is correct. Choice A is incorrect as changing levels of atmospheric carbon dioxide provide evidence for humans' impact on carbon dioxide levels. Choices C and D are incorrect as evidence suggests that the rate of ev:llb;: qfnx q)olution and speciation are increasing, which provides evidence for increasing biodiversity.
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