The ________ internally divides the thoracic cavity from the abdominal cavity.
A. mediastinum
B. umbilicus
C. viscera
D. diaphragm
Answer:D
The ________ internally divides the thoracic cavity from the abdominal cavity.
A. mediastinum B. umbilicus C. viscera D. diaphragm
Explanation: A) The mediastinum is contained within the thoracic cavity.