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    Biology GCSE

    Levels of organisation

    What Levels of organisation means in Biology GCSE, as defined for AQA.

    Definitions of Levels of organisation

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    Reference: AQA

    A tissue is a group of similar cells working together, an organ is several tissues working together, an organ system is several organs working together, and the whole organism is all the systems combined.
    AQA · Cell specialisation (study guide)
    The hierarchy in which cells form tissues, tissues form organs, and organs form organ systems.
    AQA · Principles of organisation (study guide)

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