Nhận biết (M1)

Why do Iberian lynxes purr but lions roar? Researchers hypothesize that this difference between the two feline species may be partly due to a U-shaped bone in their throats called the hyoid. Iberian lynxes, which are much smaller than lions, have a rigid hyoid that rumbles when the cat's larynx vibrates, resulting in a purr. By contrast, lions have a somewhat flexible hyoid, and the bone is attached to the skull with a stretchy ligament that Iberian lynxes lack. These traits allow lions and most other species of big cats to produce powerful roars. The same traits may also prevent most big cats from purring.

Which choice best states the main purpose of the text?

• A.

  The text summarizes information about the hyoid bone in cats and other animals.

• B.

  The text describes how two feline species communicate with each other.

• C.

  The text provides a possible explanation for a difference between two feline species.

• D.

  The text argues that some feline traits are more important than others.