Answer:
The correct answer is biopsychosocial model. 
Explanation:
An interdisciplinary model that provides an interrelation between the psychological, biological and socio-environmental elements is known as the biopsychosocial model. The model illustrates the facts that how the association between the mentioned factors plays an essential function in the fields of health and development of humans.  
The model was postulated by George Engel in 1977 and is the first of its type to illustrate this kind of multidisciplinary thinking. However, the model has been rejected by many, but still, it has an influence in the fields of health, medicine, psychology, and the development of human beings.  
 
        
             
        
        
        
An insulating plate, such as plastic, tends to be positively charged when rubbed with cloth due to the piezoelectric effect. This phenomenon involves certain materials to generate charged particles as a response to mechanical stress applied to it. In this case, the mechanical stress was due to the rubbing motion. 
        
             
        
        
        
Answer:
The correct answer is "Koch's postulates".
Explanation:
The missing options of this question are:
a) spontaneous generation
b) Koch's postulates
c) epidemiology
d) vaccination
The correct answer is option b) "Koch's postulates".
Koch's postulates propose four criteria used to establish that a pathogen is responsible for a disease. In his famous experiments, Robert Koch was able to prove that <em>Bacillus anthracis</em> is the cause of anthrax by injecting to a mouse an isolated culture from the blood of an injected sheep. The scenario established in the question is very similar to anthrax, and the scientific approach to look for the pathogen of the disease is following the principles of Koch's postulates.
 
        
             
        
        
        
the correct answer is actually electrical energy but in this case the answer is D) solar energy 
 
        
             
        
        
        
its actually not important  to have negative control  it needs to be positive control for the water to actually flow!