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Multicellular organisms are composed of many different types of specialised cells, each adapted to perform a particular function. These cells are organised into tissues, organs and organ systems to carry out the complex processes required for life. The Edexcel A-Level Biology specification (9BI0) requires you to understand examples of cell specialisation and the levels of biological organisation.
Cell specialisation (also called cell differentiation) is the process by which cells develop specific structural and functional adaptations to perform particular roles. Specialised cells have a structure that is closely related to their function — this is the principle of structure-function relationships that underpins much of biology.
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