In APS, developmental continuity does not depend upon the preservation of the same material components, structures, or developmental states across time.
Living systems continually change throughout development:
- molecules are replaced,
- cells divide and die,
- tissues reorganise,
- functions transform,
- and organism–environment relations shift continuously.
Yet despite these changes, the living system persists as the same organised system.
What persists is not static material identity, but organisational continuity.
Development therefore involves continual transformation within a maintained viability-oriented organisation. Stability is achieved not through immobility, but through regulated adaptation, coordination, and constraint-guided change.
This is why developmental identity cannot be reduced to:
- fixed structures,
- genetic templates,
- or static forms.
A developing organism remains itself because the organisation sustaining viability continues across time even while material composition and functional organisation change substantially.
Development is therefore best understood as organised persistence through regulated transformation.
Continuity is not the absence of change. It is the organised maintenance of viability across continual change.