Question

expansion in the size of the chest cavity indicates breathing digestion exhalation inhalation​

Answer 1

Answer:

it is inhalation.........

Answer 2

Answer:

When you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. This increases the space in your chest cavity, into which your lungs expand. The intercostal muscles between your ribs also help enlarge the chest cavity. They contract to pull your rib cage both upward and outward when you inhale.

Hence the size of the chest cavity increases during inhalation is a true statement.