A climax community is a community that . a. is a stable community that no longer goes through major ecological chnages

b. has just been radically altered by a natural disaster

c. is about to experience a major change

d. is always characterized by large trees

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

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.