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Important historical differences between Europe and North America may explain why many European migratory songbirds, in contrast to North American migratory songbirds, thrive in forest habitats fragmented by human activity. First,the Pleistocene glaciations may have been more severe in Europe than in North America. Virtually all Europe's forests were erased during the most recent Ice Age. Any European songbirds dependent upon large,intact blocks of forest were unlikely to survive. In the southern part of North America, however some forests managed to persist through the coldest times, to the advantage of some forest-dwelling songbirds. Second, European forests were being abused by humans for thousands of years before the North American forests were. Consequently, European birds have had more time to adapt to a human-dominated landscape.

According to the passage, which of the following is true about today's European migratory songbirds?

A.They generally are not dependent on large, intact blocks of forest.
B.They generally are less sensitive to cold temperatures than are North American songbirds.
C.They tend to be unevenly distributed across Europe because of differences in habitat.
D.Most would be unlikely to survive additional fragmentation of their preferred habitat.
E.Most represent species that evolved after the Pleistocene glaciations

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