a dominant theme in understanding the manifestation of stress is that

Illness is the result of the interaction of biological, psychological socia and cultural factors. This is a form of comprehensive evaluation of a person.  This is usually done in a question and answer format where the specialist will ask questions and the patient should answer in the  truth as possible. This assess the general well being of the person. Questions can changes depending on the state of the patient. The answers received in this way are then used as a guide in making the appropriate management plan for the patient.

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem