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According to some social analysts, throughout recorded history only five societies have been slave societies. Those in which the social and economic impact of slavery was extensive include ancient Greece, the Roman Empire, the United States, the Caribbean, and Brazil.
Wavelength
The distance between successive crests of a wave, especially points in a sound wave or electromagnetic wave.
Crests
The peaks or highest points of a wave, often used in the context of waves in physics or oceanography.
Amplitude
In physics, it refers to the maximum extent of a vibration or oscillation, measured from the position of equilibrium.
Rods
Photoreceptors in the retina of the eye that are responsible for vision at low light levels, but cannot discern color.
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