Dear Satish ,

Biology is the natural science that studies life and living organisms, including their physical structure, chemical processes, molecular interactions, physiological mechanisms, development and evolution. Despite the complexity of the science, certain unifying concepts consolidate it into a single, coherent field or other  the science of life or living matter in all its forms and phenomena, especially with reference to origin, growth, reproduction, structure, and behaviour. the living organisms of a region the biology of Pennsylvania.

Thanks