Cold sores - painful sores on the lips and around the mouth, caused by a virus. Canker sores - painful sores in the mouth, caused by bacteria or viruses. Thrush - a yeast infection that causes white patches in your mouth. Leukoplakia - white patches of excess cell growth on the cheeks, gums or tongue, common in smokers.
Metabolism is a combination of chemical reactions that are spontaneous and release energy and chemical reactions that are non-spontaneous and require energy in order to proceed. Living organisms must take in energy via food, nutrients, or sunlight in order to carry out cellular processes.
The Importance of Biodiversity. Biodiversity is extremely important to people and the health of ecosystems. A few of the reasons are: 1  Biodiversity allows us to live healthy and happy lives. 2  It provides us with an array of foods and materials and it contributes to the economy.