What would cells want to keep some particles in homeostasis and others in equilibrium?

cells need ATP to absorb nutrients into their semi permeable cell wall..or cytoplasm.

Explanation:

the cell can "so to speak" absorb the needed nutrients and block nutrients that are not needed. this is to enforce homeostasis, that the body stays within certain boundries... which is the definition of homeostasis..

above statement is not a true statement about the open ocean because the open ocean has low levels of nutrients. most of the photosynthetic activity on earth occurs in the open ocean within the photic zone. organisms in the deep ocean are exposed to frigid temperatures and total darkness but it does not begin at the low-tide mark.