Although much about dolphin communication remains a mystery, scientists have discovered three distinct sounds that dolphins frequently make: chirps, clicks, and whistles. Scientists have learned that dolphins use clicks to create a sonar map, which allows them to navigate and hunt. But apart from possibly transmitting location, the clicks do not appear to serve any communication purpose. Rather, research indicates that dolphins communicate with each other by whistling. This discovery has necessitated further investigation, as scientists are not yet sure whether the whistles comprise a complex system of linguistic communication or a simple set of sonic cues like the ones used by other animal species.

According to the passage, the whistles are significant in part because they

prompt questions about the complexity of dolphin communication


The author declares that whistles are important because scientists think dolphins whistle to communicate with each other, and scientists want to learn how advanced this communication system is, which matches choice (B).

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