in the study of cancer, researchers have used different types of cells, different enviormental conditions, and different experimental designs. But, all researchers have arrived at the same conclusion. What does this say about the conclusion

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.