共查询到20条相似文献,搜索用时 15 毫秒
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Lee N 《BMJ (Clinical research ed.)》2000,321(7253):108; author reply 109
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K S Channer 《BMJ (Clinical research ed.)》1993,307(6912):1146-1147
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May RM 《Comptes rendus biologies》2011,334(5-6):346-350
Over the past century, documented extinctions in well-studied taxonomic groups have been at rates one hundred-fold to one thousand-fold above the average extinction rates seen over the half billion year sweep of the fossil record. But for most groups, particularly invertebrates, we are very uncertain how many species there are on Earth today, much less rates of extinction. 相似文献
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