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Some male birds and mammals congregate in communal courting grounds called leks.
Electrocardiography. (a) Electrodes are placed on the patient’s chest to record the electrical event
Diphtheria. The bacteria that cause this disease, called Corynebacterium diphtheriae, proliferate in
Herbert Spencer (1820–1903), sometimes called the second founder of sociology, coined the term ...
The physician uses two hands for deep bimanual palpation.
Two woodcuts from Darwin’s 1872 book, The Expression of Emotions in Man and Animals, that he used ...