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.
In the first blank I see the contrast word "WHILE’ which is (-ve) and I see (,) so left side and right side says the same thing. For 2nd blank I figured out the ans to be declining/falling which is (-ve) so,
(-ve) x (+ve) = (-ve). So 1st blank should be a positive word. But my answer is wrong.