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Biology is the scientific study of life.
It is a natural science with a broad scope but has several unifying themes that tie it together as a single, coherent field.
For instance, all organisms are made up of cells that process hereditary information encoded in genes, which can be transmitted to future generations. Another major theme is evolution, which explains the unity and diversity of life.
Energy processing is also important to life as it allows organisms to move, grow, and reproduce.
Finally, all organisms are able to regulate their own internal environments.
Biology O'Level Notes Form 1, 2, 3 & 4 Biology Notes - All Topics
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Biologists are able to study life at multiple levels of organization. From the molecular biology of a cell to the anatomy and physiology of plants and animals, and evolution of populations.
Hence, there are multiple subdisciplines within biology, each defined by the nature of their research questions and the tools that they use.