For a living thing to function properly, its internal environment must maintain , or be kept relatively constant. this applies to individual cells as well as entire organisms.

homeostasis

Explanation:

Living beings maintain the constant environment of the body. It is called homeostasis. Homeostasis is the maintenance of a relatively stable internal environment of the body. It is the result of all of the body’s regulatory processes.

For example, the blood glucose level is normally maintained between 70 and 110 milligrams of glucose per 100 ml of the blood. A rise of blood glucose level is counteracted by increased secretion of the hormone insulin from the pancreatic cells. Therefore, cells and higher levels such as organs and organ systems, contribute to maintaining homeostasis.

a scenario where a cell may be needed to perform a form of endocytosis is when transporting large molecules. a scenario where a cell may be needed to perform a form of exocytosis is when releasing the large molecule from the cell.