Afossil found under a layer of rock is usually

older than the rock

made from a different type of rock

evolved from the rock

younger than the rock

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.