Biology is the natural science that involves the study of life and living organisms, including their physical and chemical structure, function, development and evolution. Modern biology is a vast field, composed of many branchesorganisms, including their physical and chemical structure ,function,devlopment and evolution.modern biology is a vast field, composed of many branches. 

Biology is the natural science that involves the study of life and living organisms, including their physical and chemical structurefunctiondevelopment and evolution.[1] Modern biology is a vast field, composed of many branches. Despite the broad scope and the complexity of the science, there are certain unifying concepts that consolidate it into a single, coherent field. In general, biology recognizes the cell as the basic unit of life, genes as the basic unit of heredity, and evolution as the engine that propels the creation of new species. It is also understood that all organisms survive by consuming and transforming energy and by regulatingtheir internal environment.

Sub-disciplines of biology are defined by the scale at which life is studied, the kinds of organisms studied, and the methods used to study them: biochemistry examines the rudimentary chemistry of life; molecular biology studies the complex interactions among biological moleculescellular biology examines the basic building-block of all life, the cellphysiology examines the physical and chemical functions of tissuesorgans, and  systemsecology examines how organisms interact in their environment; and evolutionary biology examines the processes that produced the diversity of life.

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