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Biology is a natural science concerned with the study of life and living organisms , including their structure, function, growth, evolution , distribution, and taxonomy . [ 1 ] Biology has many subdisciplines unified by five so-called axioms of modern biology: [ 2 ] Cells are the basic unit of life Genes are the basic unit of heredity New species and inherited traits are the product of evolution An organism regulates its internal environment to maintain a stable and constant condition Living organisms consume and transform energy