When cells divide or multiply, the dna must be copied, or replicated. all known organisms replicate their dna by a method known as semi-conservative replication, in which each of the two strands of the parent dna becomes part of the daughter dna?

answer: c

explanation:

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.