And they are This system forms a cage around your lungs and heart. It is a way to protect these organs. These are your
part of your
system
A)
ribs, skeletal
B)
muscles, muscular
09
arteries, circulatory
D)
white blood cells, immune

answer; i believe that the correct answer is (b) melosis; plz check first.good luck

i'd say that the moon rock is about 2.2 billion years old.

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.