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How did Andrew Johnson's becoming president affect blacks?
Wave
A wave is a disturbance that transfers energy through space and matter, often described by its amplitude, wavelength, frequency, and speed.
Artifact
An object made by a human being, typically of cultural or historical interest.
Pulse Oximeter
A noninvasive device used to measure the oxygen saturation level of the blood and the heart rate through a sensor attached to the fingertip or earlobe.
Blood Oxygen
A measure of the amount of oxygen carried by the hemoglobin in the blood, typically expressed as a percentage.
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