GRE Text Completion Question 902
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Source: Red
The noisy begging of a brood of baby birds is a (i) _____ to biologists: why would any helpless, immature organism do something that seems so likely to endanger it by (ii) _____ predators.
| Blank(i) | Blank(ii) |
|---|---|
| A conundrum | D attracting |
| B signal | E outwitting |
| C given | F repelling |