Cellular Respiration
Anaerobic organisms, such as certain bacteria and archaea, metabolize food to make energy in the absence of oxygen through a process called anaerobic respiration or fermentation. These organisms have adapted to survive in low-oxygen environments by using alternative electron acceptors to produce ATP.
Most animals, including humans, use oxygen for respiration. This process involves taking in oxygen from the atmosphere and using it to break down food molecules to produce energy.
Oxygen is essential for most living organisms because it is used in the process of cellular respiration to produce energy. Organisms use oxygen to break down food molecules and generate ATP, the energy currency of cells. Without oxygen, many organisms would not be able to carry out this vital process and would not survive.
Organisms which need oxygen are called aerobic organisms or aerobes. The oxygen is used in the process of respiration to release energy from food. Organisms which do not use oxygen in respiration are called anaerobic organisms or anaerobes. See: http://en.wikipedia.org/wiki/Aerobic_organism
photosynthesis
Cellular Respiration!
is a process that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight. So its a type of food for plants. Other organisms get - oxygen as a waste product from the plants. Photosynthesis is vital for all aerobic life on Earth. As well as maintaining the normal level of oxygen in the atmosphere, nearly all life either depends on it directly as a source of energy, or indirectly as the ultimate source of the energy in their food
photosynthetic
All your energy comes from the oxidation of your food.
All multicellular organisms need to obtain energy by consuming food or other organisms. This energy is essential for cellular processes like growth, development, and metabolism.
cellular respiration
AerobicRespiration = is the controlled release of energy from food using oxygen.