GRE Text Completion Question 954

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Source: Red

While the cerulean warbler's status may be particularly (i) _____, it is just one of the many species of migrant birds whose numbers have been (ii) _____for years. Increasingly, biologists investigating the causes of these (iii) ______are focusing on habitat loss in the Tropics,where the birds spend the winter.

A precarious D underreported G pairings
B secure E falling H migrations
C representative F copious I copious

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