Many fish species exhibit remarkable navigational precision during seasonal migrations. Atlantic salmon, for instance, return to spawn in the exact streams where they themselves were hatched, sometimes after journeys of several thousand miles. Researchers attribute this homing ability to a combination of magnetic-field sensing and chemical memory of natal water.
Which choice best describes the function of the second sentence in the text?
- A
It contradicts the claim made in the first sentence.
- B
It defines the term 'migration'.
- Ccheck_circle
It illustrates the navigational precision claimed in the first sentence with a specific example.
- D
It introduces a different fish unrelated to migration.
Explanation
The salmon case exemplifies the opening claim. B captures the illustrative function.