Recent tracking studies reveal that Arctic terns migrate from Arctic to Antarctic regions annually, covering approximately 44,000 miles round-trip. Despite their small size—weighing just 100 grams—these birds accumulate substantial fat reserves before each leg of the journey and can sleep while gliding on wind currents.
Based on the text, it can be inferred that Arctic terns
have evolved specialized adaptations for long-distance travel
are the largest migratory birds in the world
prefer warm climates to cold regions
rarely complete their full migration route
Correct Answer: A
Choice A is the best answer. The described behaviors suggest evolutionary adaptations.
- Context clues: They "accumulate substantial fat reserves" and "can sleep while gliding on wind currents."
- Meaning: These specific abilities enable a 44,000-mile journey despite weighing only 100 grams.
- Verify: Such specialized behaviors strongly suggest evolutionary adaptations for long-distance travel.
💡 Strategy: Connect specific physical or behavioral details to broader implications about adaptation.
Choice B is incorrect because the text emphasizes their small size (100 grams). Choice C is incorrect because they travel to both Arctic and Antarctic regions. Choice D is incorrect because completing a 44,000-mile round-trip suggests successful migration.