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.
Energy and Metabolism. All living organisms need energy to grow and reproduce, maintain their structures, and respond to their environments. Metabolism is the set of life-sustaining chemical processes that enables organisms transform the chemical energy stored in molecules into energy that can be used for 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.