The law of included fragments states which of the following? select one: a. the age of a rock and the age of its fragments are the same. b. fragments found in a rock must be younger than the rock itself. c. fragments found in a rock must be older than the rock itself.

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 enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.