16Hit1600
Expression of IdeasHardConcluding with a practical application

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - Shark skin is covered in tiny tooth-like scales. - The scales reduce drag as the shark swims. - They also stop algae and barnacles from attaching. - Engineers have copied the scale pattern in a coating for ship hulls. - Hulls with the coating use less fuel.

The student wants to conclude the text by describing a practical application of the research. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Engineers have copied shark skin's scale pattern in a coating for ship hulls, which use less fuel as a result.Correct
  2. B. Shark skin is covered in tiny tooth-like scales.
  3. C. The scales stop algae and barnacles from attaching to the shark.
  4. D. Ships coated to imitate shark skin use more fuel than plain hulls.

Answer: A. Engineers have copied shark skin's scale pattern in a coating for ship hulls, which use less fuel as a result.

The application and its benefit — choice A.

Why the other answers are wrong

B. Shark skin is covered in tiny tooth-like scales.
A fact about sharks, not an application.
C. The scales stop algae and barnacles from attaching to the shark.
What the scales do for the shark, not what people have made from them.
D. Ships coated to imitate shark skin use more fuel than plain hulls.
The notes say coated hulls use LESS fuel.

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