Temperature is very important in all biological systems. Temperature inuences the movement of atoms and molecules and their rates of biochemical activity. Active biological life is, in general, restricted to a temperature range of 0-45°C . Cold-blooded organisms are generally restricted to habitats in which the ambient temperature remains between 0°C and 40°C. However, a variety of temperatures well outside of this occurs on earth, and by developing the ability to maintain a constant body temperature, warm-blooded animals; for example, birds, mammals, including humans have gained access to a greater variety of habitats and environments .