An ornithologist observes that birds in mountainous regions have more robust chest muscles and larger wings compared to those in forests. Which structural adaptation is being demonstrated?
Facilitating sustained flight in thin air
At high altitudes the atmosphere is thinner, so each wing stroke pushes fewer air molecules and generates less lift per beat. Birds living there must beat their wings harder and more often to stay airborne.
Larger wings sweep a greater volume of air per stroke, increasing the lift produced, while more robust pectoral (chest) muscles supply the extra power required to flap those wings continuously against the reduced air density.
Nest building and egg production are behavioural or reproductive traits, and camouflage is about colouration, so none of them explains bigger flight muscles and wings.
Hence, this structural adaptation facilitates sustained flight in thin air.
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