In nature evolution itself may be thought of as an extension process. Here a partial structure may be any living organism on which evolution acts (certain conditions like: hot and dry weather, limited food supply, space limitations etc.), and the final structure is the adapted organism to the given conditions. In this sense anatomy (form) and behaviour may play key roles, as the organism will try to adapt in every possible way. The extension may best be considered as continuous, although if we are rigorous it is still discrete. (There are a finite number of substances changing on the atomic level). In this case there is always an outcome. If we consider offspring then we get a cascade of extended structures, which may nevertheless be considered as subsequent extensions. Below is an experiment showing the development of a constrained plant. Here the extension process is the constraint presented by the net to which the plant adapts.

                Figure 2: A plant evolving under the constraint of a net