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Information and IdeasHardInference from a mismatch in anatomy

Information and Ideas practice question

The skeleton of the extinct bird has a large, robust keel — the ridge on the breastbone to which flight muscles attach — yet its wings were tiny. Since a keel that size would be useless for flight with such wings, the bird most likely ____

Which choice most logically completes the text?

  1. A. used its powerful chest muscles for something other than flying, such as swimming.Correct
  2. B. was able to fly long distances.
  3. C. had no chest muscles at all.
  4. D. was a young bird whose wings had not yet grown.

Answer: A. used its powerful chest muscles for something other than flying, such as swimming.

A big keel means big chest muscles; tiny wings rule out flight. So the muscles served another purpose — swimming is one such use.

Why the other answers are wrong

B. was able to fly long distances.
The text says the wings were too small for flight.
C. had no chest muscles at all.
A robust keel implies large muscles, not none.
D. was a young bird whose wings had not yet grown.
Nothing suggests the bird was young; the text treats the tiny wings as the species' feature.

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