Which of the following processes primarily supports cellular waste removal?

Exocytosis is the process that primarily supports cellular waste removal because it involves the expulsion of materials from the cell. During exocytosis, vesicles within the cell fuse with the plasma membrane, releasing their contents, which can include waste products, into the extracellular environment. This mechanism is crucial for maintaining cellular homeostasis and ensuring that toxic substances do not accumulate within the cell, thereby promoting overall cell health and function.

While diffusion, endocytosis, and active transport all play roles in cellular processes, they do not primarily focus on waste removal in the same way. Diffusion is a passive process that allows substances to move from areas of higher concentration to lower concentration, but it does not specifically target waste removal. Endocytosis is the process of engulfing substances into the cell, which is useful for nutrient uptake but does not assist in expelling waste. Active transport requires energy to move substances against their concentration gradient, which is essential for nutrient uptake and ion regulation but not specifically for removal of waste products from the cell. Thus, exocytosis is the correct choice for the process that primarily supports cellular waste removal.