How does G. R.A. P.E. S. help to contribute to the rise of the early civilizations

Using GRAPES makes it easier to focus on the major themes, ideas, and accomplishments each ancient civilization has had throughout history. It gives you a road map on what things to emphasize, especially if you have limited time to cover many topics.

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.

where in your body is there an enzyme that does function at a high or low ph? what is the name of that enzyme and its function?