Biologists study life on many different levels. For example, a cellular biologist is concerned with the most basic unit of life, the single cell, whereas an evolutionary biologist may investigate the origin and genealogical history of a particular species of plant or animal life. The molecular biologist is concerned with understanding the biological phenomena of life at the molecular level. Molecular biology is a multifaceted discipline of recent origin, having emerged in the 1980s from the related fields of biochemistry, genetics, and cell biology.
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