Basic Principles of Biology

The Nine characterisitics of Life shows the connection for the Basic Principles of Biology
With these things in mind, it brings about the Basic principles of Biology:
( http://biology.about.com/od/apforstudents/a/aa082105a.htm )
The foundation of biology as it exists today is based on five basic principles. They are the cell theory, gene theory, evolution, homeostasis, and laws of thermodynamics.

• Cell Theory: all living organisms are composed of cells. The cell is the basic unit of life.
  
  
• Gene Theory: traits are inherited through gene transmission. Genes are located on chromosomes and consist of DNA.
  
  
• Evolution: any genetic change in a population that is inherited over several generations. These changes may be small or large, noticeable or not so noticeable.
  
  
• Homeostasis: ability to maintain a constant internal environment in response to environmental changes.
  
  
• Thermodynamics: energy is constant and energy transformation is not completely efficient.