Every mollusk has a head, body, and jointed legs a muscular foot hinged shells an external shell

 [B]:   " a muscular foot ".

     "Every mollusk has a head, body, and  muscular foot   . "

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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.