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This is a comprehensive text on prospective biology majors and a grasp of the structure of evolutionary theory, the evidence for it, and the scope of its explanatory significance. Biology is the science of life. Biologists study the structure, function, growth, origin, evolution and distribution of living organisms. Modern biology is a vast and eclectic field, composed of many branches and subdisciplines. However, despite the broad scope of biology, there are certain general and unifying concepts within it that govern all study and research, consolidating it into 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 synthesis and creation of new species.