of changes from start conditions to termination conditions. There are three distinguishable aspects of this characterization:

;Ontic aspect
:The ontic constituency of biological mechanisms includes entities and activities. Thus, this conception postulates a dualistic ontology of mechanisms, where entities are substantial components, and activities are reified components of mechanisms. This augmented ontology increases the explanatory power of this conception.

;Descriptive aspect
:Most descriptions of mechanisms (as found

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