List four things that cells do to maintain homeostasis.

Cells maintain homeostasis through several key processes:

1. Regulation of the Internal Environment: Cells control the concentration of ions, nutrients, and water within themselves to maintain a stable internal environment. This includes processes like osmoregulation and ion transport.

2. Energy Production and Utilization: Cells produce energy through cellular respiration and use this energy to perform various functions necessary for maintaining balance, such as active transport and synthesis of molecules.

3. Response to External Stimuli: Cells can detect changes in their environment and respond appropriately. This includes mechanisms like signal transduction pathways that allow cells to adapt to changes in temperature, pH, and other external factors.

4. Waste Removal: Cells actively remove waste products and toxins through processes like exocytosis and the use of lysosomes, ensuring that harmful substances do not accumulate and disrupt cellular function.