GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - LM2LNAM6D5I5NU71J

The passage mentions which of the following as an obstacle to using animal bones to reconstruct past climate changes? A. The size of some carnivorous species' hunting territories. B. The range over which some small mammals travel. C. The ability of some species to thrive in multiple types of environment.