Difference between photosynthesis and respiration

Phototsynthesis takes water, sunlight, and CO2 and turns it into O2. Cellular Respiration take nutirents and O2 to create ATP.

the answer is :

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.