Answer:
thoracic cavity
Explanation:
The thoracic cavity is separated from the abdominopelvic cavity by the diaphragm. The thoracic cavity is further separated into the pleural cavity which contains the lungs and the superior mediastinum which includes the pericardial (heart) cavity.
The correct answer is : Insensible perspiration
It's the water that evaporate from your body before it is perceived as moisture on the skin, usually happened inside your lungs
Since the water is gone inside your lungs, it will be very difficult for you to feel and measure it