Scientists use relative dating to determine A. if a fossil is older or younger than the fossil around it
B. if the fossil is in sedimentary or volcanic rock
C. if two fossils are related
D. the exact age of a fossil

answer; /// i believe the name your looking for is called (plaque)or check good luck

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.