Which statement identifies a characteristic of a scientific theory? It is subjective.
It is a proven fact.
It is based on opinion.
It may change over time.

the correct answer: the index of refraction of the second medium is lower i tried this persons answer and it was wrong this person is lying

answer: 45

explanationyou have to add as well to be it could be

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.

what is this saying?