APS treats scale as a way of analysing and describing organisation rather than as a hierarchy of independently existing ontological levels.
Biological phenomena can be examined at many scales. Explanations may emphasise molecules, cells, tissues, organisms, ecological systems, evolutionary processes, or social organisation depending on the explanatory question being addressed. These scales do not represent separate worlds stacked above one another. They are different perspectives on interconnected processes of organised persistence.
Scale therefore concerns explanatory resolution rather than ontological rank. Different scales reveal different organisational relationships, different continuity architectures, and different aspects of viability-oriented persistence. No single scale is automatically more fundamental than the others simply because it is smaller.
APS consequently rejects the assumption that explanation must always proceed toward progressively smaller components. Understanding biological organisation often requires movement across scales, since continuity is coordinated through interactions linking physiological, developmental, ecological, evolutionary, and social processes.
Key Point: Scale is not a hierarchy of separate levels of reality. It is an explanatory perspective that reveals different aspects of organised persistence across interconnected domains of biological organisation.