GRE Text Completion Question 902
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.
|A conundrum||D attracting|
|B signal||E outwitting|
|C given||F repelling|
Correct Answer: AD