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Characteristics of Life

2.  Metabolic Activity: 
     The physical and chemical changes taking place in a living organism. 

3.  Homeostasis:
     The ability to maintain a constant internal environment within narrow limits. 

4.  Irritability/Responsiveness
     The ability to respond to change, or to respond to a stimulus. 

5.  Growth
     The increase in the size or number of cells. 

6.  Reproduction
     The ability to produce similar life forms.

7.  Adaptation
     The ability to meet the demands placed on the organism or system.