A gradual pattern of change that occurs in an ecosystem after a disturbance is known as

its 42

i say its d?

if your own plato the answer is b. the fern transitioned from sporophyte generation to gametophyte generation.

answer; the tunica intima also called tunica interna, consists of elastic fibers,connective tissue and smooth muscle cells;

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.