What is the name of the plant hormone that enables a plant to respond to a light stimulus?

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.

and after water is usually warmed by the sun the water temperature raises and then evaporates .