< Cell Biology < Introduction 
      Introduction to Cell Biology
It is easy to recognize life. Cats, trees in our gardens, ourselves, etc., are all alive. Computers, the air we breathe, waterfalls, etc., these are not alive. But what is life? What makes living beings different from sand, water?
Cell biology tries to answer what life is, where it comes from and how it functions. From that, cell biologists draw a general rule for all living things on Earth.
 Cats Cats
 Oak Oak
 Human Human
 Computer Computer
 Atmosphere Atmosphere
 Waterfall Waterfall
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