Hatchetfish live in very deep parts of the ocean. what challenges must they overcome to survive in this environment?

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.

the answer would be d : p