Introduction to Biology and Its Definition

Biology is the science of life (from the Greek words bios = life and logos = reasoned account). It is concerned with the characteristics and behaviors of organisms, how species and individuals come into existence, and the interactions they have with each other and with their environment. Biology encompasses a broad spectrum of academic fields that are often viewed as independent disciplines. Together, they study life over a wide range of scales. 

Life is studied at the atomic and molecular scale in molecular biology, biochemistry, and molecular genetics. At the level of the cell, it is studied in cell biology and at multicellular scales, it is examined in physiology, anatomy, and histology. Developmental biology studies life at the level of the development or ontogeny of an individual organism.

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