Piersma and Gill suggest that bar-tailed godwits-long-billed shorebirds of the Eurasian and Alaskan tundra -rank among the most _____ of the long-range fliers, traveling 11,000 kilometers nonstop across the Pacific.

Rationale

Bar-tailed godwits rank among the most unflagging and indefatigable of the long-range fliers.

Both "unflagging" and "indefatigable" convey a sense of relentless endurance and tireless energy, which is appropriate for describing the remarkable long-distance migration of bar-tailed godwits.

A (unpredictable) YOUR ANSWER

This term suggests a lack of consistency or reliability in behavior, which does not fit the context of the sentence. The sentence is emphasizing the exceptional endurance of these birds during their long migration rather than any variability in their flight patterns.

B (versatile) YOUR ANSWER

While "versatile" implies adaptability and the ability to perform well in various conditions, it does not specifically relate to the long-distance endurance aspect of the bar-tailed godwits. The focus of the sentence is on their stamina during migration rather than their general adaptability.

C (erratic) YOUR ANSWER

"Erratic" implies unpredictable and irregular behavior, which contradicts the idea of the bar-tailed godwits being exemplary long-range fliers. The sentence is highlighting their consistent ability to travel great distances, making this choice unsuitable.

D (unflagging) CORRECT

This term is appropriate as it means tireless and persistent, perfectly describing the stamina needed for the birds' extensive migratory journey. It aligns well with the context of the sentence regarding their remarkable flight endurance.

E (renowned) YOUR ANSWER

While "renowned" indicates being famous or well-known, it does not address the endurance aspect necessary for the sentence's meaning. The focus here is on their capability to fly long distances rather than their reputation.

F (indefatigable) CORRECT

This word means incapable of being tired out, which aligns perfectly with the idea of the bar-tailed godwits' long-distance migratory ability. It emphasizes their relentless nature, making it a fitting choice for the sentence.

Conclusion

The sentence effectively highlights the extraordinary endurance of bar-tailed godwits during their long migrations. The terms "unflagging" and "indefatigable" both capture the essence of tireless stamina, making them the best choices to complete the sentence in a manner that conveys similar meanings. Other options either deviate from the intended meaning or emphasize unrelated qualities.

Piersma and Gill suggest that bar-tailed godwits-long-billed shorebirds of the Eurasian and Alaskan tundra -rank among the most _____ of the long-range fliers, traveling 11,000 kilometers nonstop across the Pacific.

Bar-tailed godwits rank among the most unflagging and indefatigable of the long-range fliers.

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