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Option 3: "flightlessness"
Explanation: This option is correct because the text explicitly states that the cormorant can no longer fly, and the term 'flightlessness' directly relates to this characteristic. It highlights the main idea of the text regarding the bird's adaptation to its environment despite its inability to fly.
Option 1: "nesting habits"
Explanation: This option is incorrect because the text does not mention anything about the nesting habits of the flightless cormorant. The focus is on its inability to fly and how it compensates for that through swimming and fishing.
Option 2: "migratory patterns"
Explanation: This option is incorrect as the text does not discuss the migratory patterns of the flightless cormorant. In fact, the text implies that the bird is not migratory due to its flightlessness.
Option 4: "vocal communication"
Explanation: This option is incorrect because the text does not mention vocal communication at all. The focus is solely on the physical characteristics and behaviors of the flightless cormorant, particularly its swimming and fishing abilities.
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