According to the passage, the whistles are significant in part because they _________.
Prompt questions about the complexity of dolphin communication.
Show that dolphins are capable of expressing emotion.
Aid dolphins in navigating and hunting.
Are not used by dolphins to communicate with each other.
Detailed Explanation
The passage states that scientists have discovered that whistles are an important part of how dolphins communicate, and that “[t]his discovery has necessitated further investigation” because they do not know how advanced this communication system is.
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