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Electrocardiography. (a) Electrodes are placed on the patient’s chest to record the electrical event
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
Blood pressure measurements: Auscultation of blood pressure
A pedigree for albinism collected in the early years of the twentieth century by Charles Davenport,
A graphical representation of correlations in IQ measurements in different sets of individuals. The
Cancer cells can move to new locations in the body, a process called metastasis