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.
Then review the following statements: 1  Organisms need energy to move, grow, and keep warm. 2  Energy comes from the Sun, gets captured by plants, and is then transferred from organism to organism. 3  Energy is lost each step of the way as heat or energy needed for the chase.