Biology is a branch of Science which focuses on the study of living organisms, their physiology(physical structures), morphology, anatomy (complete structure of body) , behaviour, origin and distribution.

It is further divided into many fields which specialize on certain aspects of biology. 

For example, a doctor specializes in treatment, an ornithologist specializes in study of birds, an entomologist specializes on the study of insects, etc.
Biology is the study of living organisms, divided into many specialized fields that cover their morphology, physiology, anatomy, its origin and the  distribution..
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