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.

Blank (i)	Blank (ii)	Blank (iii)
(A) precarious	(D) underreported	(G) pairings
(B) secure	(E) falling	(H) migrations
(C) representative	(F) copious	(I) declines

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Explanation



The meaning of the sentence is that the birds, the species, are going to decline. As such, you need 3 words in this fashion.

This kind of specie of bird X is precarious in its amount, I.E they are in dangerous BUT at the same time lots of species are in the same situation, falling for years in numbers. So, the scientists are investigating this decline.

Hope this helps.
regards
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