EXCRETION AND HOMEOSTASIS (PLANT AND ANIMAL)
Excretion is the process by which living organisms separate and eliminate waste products of metabolism from body cells.
If these substances were left to accumulate, they would be toxic to the cells.
Egestion is the removal of undigested materials from the alimentary canals of animals.
Secretion is the production and release of certain useful substances such as hormones, sebum and mucus produced by glandular cells.
Homeostasis is a self-adjusting mechanism to maintain a steady state in the internal environment