OG 12th version-3th passage--7th Question， help

naoyixue

各位，

昨天作题，碰见一个问题，

首先。这段话没有特别看懂，（特别是BF部分）

原问：In considering possible explanations for this findings, the resarchers dismissed demongraphic bias because older individuals were not overrepresented in thr fossil sample.

再次，问题也没有特别看懂。
问题：the researchers' conclusion concerning the absence of demographic bias (缺乏统计的倾向） would be most seriously underminded if it were found that

最后，看了解释，好像也没有很理解清楚。（好像没有找到相应的逻辑关系，在文章中）
提示: this implies that old carnivores would br expected to have more tooth fracture than younger ones(从文章哪里爬暖出来的）谢谢

fansea

这里有讨论：
http://forum.chasedream.com/GMAT_RC/thread-417966-1-1.html?SearchText=OG12

naoyixue

谢谢啦，好心人。