What period represents the last 2 million years of geological time

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.

garbage disposal because lysosomes dispose of old cell parts like garbage disposals dispose of old food.