Its more natural and doesn't have side effects
        
                    
             
        
        
        
Homogeneous is the answer
        
             
        
        
        
Answer:
The scientific method involves deriving hypotheses from theories and then testing those hypotheses. If the results are consistent with the theory, then the theory is supported. If the results are not consistent, then the theory should be modified and new hypotheses will be generated.
 
        
             
        
        
        
In recent molecular genetic studies, genes associated with the neurotransmitter Dopamine have been linked to ADHD. 
ADHD stands for Attention Deficit Hyperactivity Disorder. People with ADHD have a hard time focusing on tasks. Scientists have found that the low levels of dopamine in the brain are associated with the symptoms of ADHD. It is because the neurons in the brain have a high amount of protein called the dopamine transporters. These proteins block the dopamine from passing between the neurons. This decreases the effect of dopamine.