Biology is a natural science concerned with the study of life and living organisms, including their structure, function, growth, origin, evolution, distribution, and taxonomy. Biology is a vast subject containing many subdivisions, topics, and disciplines. Among the most important topics are five unifying principles that can be said to be the fundamental axioms of modern biology:

1. Cells are the basic unit of life
2. New species and inherited traits are the product of evolution
3. Genes are the basic unit of heredity
4. An organism regulates its internal environment to maintain a stable and constant condition
5. Living organisms consume and transform energy.

Subdisciplines of biology are recognized on the basis of the scale at which organisms are studied and the methods used to study them: biochemistry examines the rudimentary chemistry of life; molecular biology studies the complex interactions of systems of biological molecules; cellular biology examines the basic building block of all life, the cell; physiology examines the physical and chemical functions of the tissues, organs, and organ systems of an organism; and ecology examines how various organisms interact and associate with their environment.

Noun

biology (countable and uncountable; plural biologies)

1. The study of all life or living matter
2. The living organisms of a particular region.
   • 1893, “Prizes for original work with the microscope”, Proceedings of the American Microscopical Society, volume 14, page 38: 

     The object of these prizes is to stimulate and encourage original investigation by the aid of the microscope in the biology of North America, and, while the competition is open to all, it is especially commended to advanced students in biology in such of our universities and colleges as furnish opportunity for suitable work.

3. The structure, function, and behavior of an organism or type of organism.

   the biology of the whale

• lifelore

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