In the conservation of species, protection of entire ecosystems ensures that humans have no impact on the ecosystem abiotic factors are kept constant species interactions are preserved pollution is kept out

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.