The main function of the human digestive system is to a. Rid the body of cellular waste materials
b. Process otrganic molecules so they can enter cells
c. Break down glucose in order to release energy
d. Change amino acids into proteins and carbohydrates

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B

Explanation:

blue stars have the highest surface temp

stellar distances are usually expressed in light-years

the measure of a star's brightness is called magnitude

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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.