Which words pair is related most closely? A. shell, circulation
B. radula, feeding
C. jet-propelled swimming, bivalve
D. open circulatory sysetem, octoupus
Worth 25 points Need answer soon!!

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.

a symbiotic relationship with the mitochondria