Define excretion and Defecation.

Hint: Removal of wastes is done in these processes but both are eliminating different kinds of waste products. These two processes are part of a different system of our body.

Complete answer:
It is the elimination of metabolic waste products from the animal body to regulate the composition of body fluids and tissues. It is a part of the excretory system.
Defecation: It is the removal of wastes and undigested food, collectively called faeces through the anus. It is a part of the digestive system.

Additional Information: -The urinary tract consists of the kidneys, ureters, bladder and urethra. Your kidneys filter your blood, creating urine, which travels through the ureters to the bladder, where it is stored. When the appropriate time comes, the muscles of your bladder contract and urine exits your body through your urethra. Urinary disorders include any diseases, disorders or conditions that affect your kidneys, ureters, bladder or urethra, or that affect their function.
-Constipation is defined as small, hard, difficult, or infrequent stools. Constipation may be caused by: Inadequate "roughage" or fibre in the diet, not drinking enough fluids, Poor habits, especially delaying using the toilet, movement problems in the large bowel, including slow or uncoordinated movement. A person who is constipated may strain during a bowel movement or just pass a very hard stool.


Note: -The excretory system is the passive biological system that removes excess, unnecessary materials from the body fluids of an organism so that it can help maintain internal chemical homeostasis and stop damage to the body.
-Excretory systems regulate the chemical composition of body fluids by removing metabolic wastes and retaining the correct amounts of water, salts, and nutrients. Components of this technique seen in vertebrates include the kidneys, liver, lungs, and skin.