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 horseshoe crab.
Show Hint
- scrutinized...ensure\
- verified...advance\
- identified...distort\
- obscured...illustrate\
- clarified...reassess
The Correct Option is
Solution and Explanation
Step 2: The second blank needs a verb for reevaluating evolution with new evidence.
Step 3: "Clarified" (made clear) fits the first; "reassess" (reexamine) fits the second.
Step 4: Others fail: (A) "ensure" illogical; (B) "advance" mismatched; (C) "distort" negative; (D) "obscured" contradictory.
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