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Discuss the Soviet bloc in the 1970s and 1980s.Explain the fall of communism in east-central Europe in 1989.
Birdsong
vocalizations produced by bird species, often complex and musical, used for communication and mating purposes.
Frequency
The frequency of a wave is determined by the number of vibrations that happen per unit of time, which can happen within a material like sound waves, or within an electromagnetic field, such as in the case of radio waves and light.
Amplitude
In physics, the maximum extent of a vibration or oscillation, measured from the position of equilibrium.
Tectorial Membrane
A structure located in the cochlea of the inner ear that plays a critical role in the auditory process, interacting with hair cells during sound transmission.
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