GRE Text Completion Question 3604
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Source: PP2
Because of the excellent preservation of the fossil, anatomical details of early horseshoe crabs were _____ for the first time, enabling experts to_____ the evolution of the horse- shoe crab.
- A scrutinized . . ensure
- B verified . . advance
- C identified . . dirt
- D obscured . . illustrate
- E clarified . . reassess