The process of breakdown of glucose to obtain energy is called respiration. It is of two types: Aerobic and anaerobic respiration. Respiration that takes place in the presence of oxygen is called aerobic respiration. The organisms that perform aerobic respiration are called aerobes.

The process of breakdown of glucose to obtain energy is called respiration. It is of two types: Aerobic and anaerobic respiration. Respiration that takes place in the absence of oxygen is called anaerobic respiration. The organisms that perform anaerobic respiration are called anaerobes.

Breathing is a continuous process throughout the life of an organism. The process of inhaling oxygen and exhaling carbon dioxide is called breathing. One inhalation and exhalation constitute one breath.