Identify two features that a theory must have, to qualify as a scientific theory.

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.

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.