Results show that sea urchins develop towards a single
morphological end. When we act on an embryo the surviving cells continue to
respond to the final cause that leads to the formation of structures. Although
smaller, the structure which is reached is similar to that which would have
been obtained by the original embryo.
It follows that the final form
is not caused by the past or by a program, a project or a design which act from
the past, since any change we introduce in the past leads to the same
structure. Even when a part of the system is removed or the normal development
is disturbed, the final form is reached and it is always the same.
The Vital Needs Theory - page 65