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Widespread climate change challenges a traditional notion that preserving specific chunks of land is an adequate way to protect endangered species. Commitment to particular places has taken conservation a long way, but it works only when the climate is relatively stable. When climate change rather than degraded habitat threatens a species` survival in a particular location, moving the species to new locales might become one way of preserving it. Some ecologists argue that such assisted migration is simply a way to mimic the natural process of dispersal: its adherents intend to transport species from places that have become uninhabitable through places that humans have made impassable. Although it has its risks, assisted migration may be a necessary step in the evolution of conservation.

The author of the passage implies that some endangered species are unlikely to migrate naturally to habitats better suited to their survival because

Aclimate change is making such habitats disappear 
Bfew if any viable routes to such habitats exist
Cthe pace of natural migration is typically slower than the current pace of climate change
Dtheir numbers are already below the thresholds necessary for the typically random processes of natural dispersal
Etheir dependency on their current habitats is too strong

B显示答案

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