GRE Text Completion Question 1516
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Source: CQ
The colors and patterns on butterflies' wings may seem merely (i)_____ _____, but they are actually (ii)_____ the survival of these insects, enabling them to attract mates and to hide from predators.
| Blank(i) | Blank(ii) |
|---|---|
| A artificial | D results of |
| B unique | E instrumental in |
| C decorative | F precursors of |