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Among wide-ranging animal species, populations at the edge of the species' range are frequently exposed to less (i)_____ and more variable conditions than those in other parts on the range. As a result, the animal's abundance is often (ii)_____.
- Blank(i)
- erratic
- favorable
- demanding
- Blank(ii)
- lower at the periphery
- unaffected by habitat
- underestimated by researchers
favorable , lower at the periphery 显示答案
以上解析由 考满分老师提供。
