Ecologists have documented the extinction over the last 20 years of _______ of the 110 species of harlequin frogs (Atelopus)native to tropical America.

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The question states that ecologists have documented the extinction of harlequin frogs (Atelopus) native to tropical America over the last 20 years. Specifically, it states that out of 110 total species, a certain percentage went extinct. The only answer choice that matches this description is C) 67%, meaning that 74 out of the 110 species of harlequin frogs have gone extinct in the last 20 years.

Ecologists Have Documented the Extinction Over the Last 20 Years