Dna can make exact copies of itself through replication because the nitrogen bases always pair?

i don't know. if i were you, i would search it up online : d

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.