<Ol> <Li> Le pouvoir de la vie (the complexifying force) - in which the natural, alchemical movements of fluids would etch out organs from tissues, leading to ever more complex construction regardless of the organ's use or disuse . This would drive organisms from simple to complex forms . </Li> <Li> L'influence des circonstances (the adaptive force) - in which the use and disuse of characters led organisms to become more adapted to their environment . This would take organisms sideways off the path from simple to complex, specialising them for their environment . </Li> </Ol> <Li> Le pouvoir de la vie (the complexifying force) - in which the natural, alchemical movements of fluids would etch out organs from tissues, leading to ever more complex construction regardless of the organ's use or disuse . This would drive organisms from simple to complex forms . </Li> <Li> L'influence des circonstances (the adaptive force) - in which the use and disuse of characters led organisms to become more adapted to their environment . This would take organisms sideways off the path from simple to complex, specialising them for their environment . </Li> <P> The idea that germline cells contain information that passes to each generation unaffected by experience and independent of the somatic (body) cells, came to be referred to as the Weismann barrier, and is frequently quoted as putting a final end to Lamarckism and theory of inheritance of acquired characteristics . </P>

What is the principle of use and disuse