Why are human cells different?

Human cells are different from plant cells because human cells do not have chloroplasts and do not have cell walls. Human cells also use the Krebs Cycle for energy while plant cells use Calvin Cycle.

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.

. ph changes the ability of them he enzyme to dissolve in water.