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Some male birds and mammals congregate in communal courting grounds called leks.
Photograph of the flea that transmits Yersinia pestis to cause bubonic plague, called the oriental r
In 1839 Mary Cragin, at the age of twenty-nine, became a convert to John Humphrey Noyes’s “communism
Squamous cell carcinoma.
Lymphatic system vessels and the flow of lymph.
Cancer cells can move to new locations in the body, a process called metastasis