* Cell Membrane Functions: The cell membrane is the outer boundary of a cell, acting as a barrier and a gatekeeper. Its key functions include:

* Regulation of Transport: Controls what enters and exits the cell, allowing for the passage of nutrients and the removal of waste products.

* Protection: Provides a physical barrier that protects the cell's internal environment.

* Cell Signaling: Receives signals from the environment and other cells, allowing the cell to respond to its surroundings.

* Maintaining Homeostasis: The cell membrane helps to maintain a stable internal environment (homeostasis) by regulating the movement of substances across the cell membrane. This includes maintaining the proper balance of water, pH, and other important molecules.

* Other Options:

* Producing cellular nutrients: This is primarily done by organelles like chloroplasts (in plants) and mitochondria.

* Preserving wastes: While the cell membrane does help remove some waste products, the cell also has other mechanisms for waste disposal.

* Neutralizing chemicals: While the cell can sometimes neutralize certain chemicals, this is not a primary function of the cell membrane.

In summary, the cell membrane's role in maintaining homeostasis is crucial for the survival and proper function of all cells.