GRE Text Completion Question 3162
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Source: 2008
The noisy begging of a brood of baby birds is a _____ to biologist : why would any helpless, immature organism do something that seems so likely to endanger it by _____ predators?
- A Conundrum ; attracting
- B Paradox ; outwiting
- C Given ; drawing
- D Signal ; startling
- E Puzzle ; repelling