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 higd6e6 y0)o7x io+ gm: dl(rwlnuher level ofg r6 d,wqr 4apytqd450 biodiversity now compared to any time in the g qyr4d,wp5 40dt ra6qpast?
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 via ezxra:5:wjn; ;b67 l tv c7wtnu.:jo mthe fossil record for any era is much lower compared to the number of organisms found on Earth now and tho mtjw:j6 c7an u.t ;;wlbzxe:5r n:ov7se 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 evolution and speciation are increasing, which provides evidence for increasing biodiversity.
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