Biology is the science of living organisms. Biology examines the function, structure, origin, growth, evolution, classification and distribution of all living things.

Traditionally, the specialized disciplines of biology are grouped by the type of organism being studied: zoology, the study of animals; botany, the study of plants; microbiology, the study of microorganisms.

These fields are further divided based on the scale at which organisms are studied and the methods used to study them: molecular biology studies the complex interactions of systems of biological molecules, biochemistry examines the fundamental chemistry of life, cellular biology examines the basic building block of all life, the cell; physiology examines the physical and chemical functions of the tissues and organ systems of an organism; and ecology examines how various organisms interrelate with their environment.

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