how early conditions affected the type of organism that developed (first anaerobic and prokaryotic, them photosynthetic, then eukaryotic, then multicellular)

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.