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Several species of squirrels have melanistic phases. In large parts of United States and Canada, the
Anatomical and common names for the pectoral girdle and upper extremity.
McBurney’s point is the common location of pain in children and adolescents with appendicitis.
Early in the twentieth century, when malnutrition was common, companies such as this one advertised
This ciliated protozoan is a Stentor. Stentor are common in freshwater lakes and rivers
Photos simulating vision with two common visual disorders