Functional Adaptations in Animal Groups · Zoology

Which adaptation enables birds to meet high energy demands during flight?

  1. Low resting metabolic rate throughout
  2. Air sacs with unidirectional airflow
  3. Ectothermic, cold-blooded physiology
  4. A simple, single-chambered heart
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Correct answer: Air sacs with unidirectional airflow

Birds possess air sacs that ensure continuous airflow through lungs. This supports high oxygen demand during flight.

Difficulty: Medium Question 12 of 20

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