Listening to __________ is like putting a stethoscope to a person’s heart, though scientists don’t hear just one animal at a time.
the musicians
the calls
the researchers
the problems
Listening to __________ is like putting a stethoscope to a person’s heart, though scientists don’t hear just one animal at a time.
the musicians
the calls
the researchers
the problems
The correct answer is the calls.
Explanation: The phrase suggests that listening to “the calls” of animals allows scientists to understand their communication, similar to how a stethoscope lets us listen to a person’s heartbeat. This illustrates how animal calls provide insights into their behavior and interactions in nature.