Steps. 1  1. Purchase Tincture of Iodine. Iodine is available at most drug stores in the first aid section. Buy an iodine solution with 2% iodine. 2  2. Wash and dry the affected areas. Use antibacterial soap and warm water to cleanse the ringworm site. 3  3. Apply the tincture of iodine. Iodine comes in a small glass or plastic bottle.
Excretion is important for living things because a build up of the waste products from these chemical reactions is very dangerous for the body because it can, in excess, be poisonous. Be careful though, faeces is NOT excretion.
Consequently, excretion is necessary in order to separate these wastes from the tissues and eliminate them from the body. Examples of some waste products eliminated by the excretory system include the removal of carbon dioxide in the air we exhale, and unwanted nitrogen in sweat, nails and hair.