SAT Text Structure and Purpose Question
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 Melissa 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?
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The trap here
Text Structure: naming what a sentence says instead of what it does — "What is the function of the underlined sentence?" asks for its job in the paragraph, not its content.