Here's why:

* Excretion is the process by which metabolic waste products are removed from the body.

* These waste products can be harmful if allowed to accumulate, so excretion is essential for maintaining homeostasis (stable internal environment).

Examples of excretory organs and their functions:

* Kidneys: Filter blood and produce urine, eliminating excess water, salts, and nitrogenous wastes (like urea).

* Lungs: Exhale carbon dioxide, a waste product of cellular respiration.

* Skin: Sweat glands release sweat, which contains excess water, salts, and some urea.

* Liver: Processes many waste products, converting them into less harmful forms that can be excreted by the kidneys.

* Intestines: Eliminate undigested food and other waste products through feces.

While the term "elimination" is sometimes used interchangeably with excretion, it specifically refers to the removal of undigested food and other waste products from the digestive system.