Which of the following best describes a process that helps a cell maintain homeostasis without requiring energy to be used? (2 points) Channel proteins provide a passage for molecules to cross the membrane via facilitated diffusion.

Membrane carrier proteins help substances enter the cell against a concentration gradient.

Pieces of the cell membrane for vesicles circulate around extracellular materials during endocytosis.

Protons are pumped out of the cell to create a voltage across the cell membrane.