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 biodive8*q wb p +v-taq53jhtoljid61rsity now compared to any tdjpw85 v joh+i136-q qbl* ttah imc79 u;ze6pime ie6zui 9mcp ;7hn 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 via the fossil record for any era is much lower co;)1fn1ndzkn2m1t fl.gqv gy 4mpared 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 evolution and speciation are incr m1qntn ygl)1fk; .21 fgzd4nveasing, which provides evidence for increasing biodiversity.
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