Biopsy of a purple mass in the tongue of a 67-year-old man showed numerous vascular channels lined by benign endothelial cells. The lesion was not encapsulated, and the vascular channels were filled with blood. This is a description of a:

The vibration created by percussion penetrates the lung to approximately what depth?

a. 1 to 2 cm b. 3 to 5 cm c. 5 to 7 cm d. 8 to 10 cm

An example of an experimental study would be a study intended to investigate the relationship between cigarette smoking and lung cancer in which the investigator only determines each subject's smoking behavior and whether or not they develop lung cancer.

Answer the following statement true (T) or false (F)