Why is replication sometimes considered an essential follow up to the five steps of the scientific method?

gfgfgfgfgfgf

explanation:

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

the correct answer is b

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.