[Campbell Biology P.789] Which of the following statements accurately describes the anatomic... | Practice Question

Which of the following statements accurately describes the anatomical characteristics of ratites that contribute to their flightless nature?

  • A: They possess a prominent sternal keel for powerful flight muscles.
  • B: Their pectoral muscles are large and highly developed, similar to flying birds.
  • C: The sternal keel is absent, and their pectoral muscles are small relative to those of birds that can fly.
  • D: They have specialized flipper-like wings for swimming, not flying in air.

Explanation

The text explicitly states, 'In ratites, the sternal keel is absent, and the pectoral muscles are small relative to those of birds that can fly.' This directly explains their flightlessness.