I’m order to maintain homeostasis cells must be able to

              B) II and Iv only

Explanation:

                    Homeostasis is the maintenance of internal environment same to that of the external environment. In order to maintain homeostasis cell must do four things is the maintenance of a constant internal state in a changing environment that is maintenance of the relatively constant ion concentration across the lipid by layer of the cell, Your cells need to be able to obtain and use energy from different kind of sources , Make new cells from already existing cell, Exchange materials across the cell membrane and water balance across the membrane and eliminate wastes from the cell. By doing these four activities cells are able to maintain homeostasis.

the wires in the toaster turning red and the toast crisping and turning brown

i believe it would cause an increase of percipitation, though i could be wrong. so i would say b is the answer.