Homeostasis refers to the necessity of an organism to maintain constant or stable internal conditions. what structure cells maintain homeostasis by regulating the movement of materials into and out of a cell?

The answer is cell membrane.

The process called Homeostasis refers to a regulating process to keep something constant. In a cell, the outer covering is called cell membrane which serves as the skin of the cell. It helps maintain homeostasis in a cell by controlling the movement of materials that enter and leave.