Answer:
Indpendant veriable cigarette smoking on lung cancer.
Dependant veriable:The number increase
Explanation:
 
        
             
        
        
        
Answer:
sensory and integration
Explanation:
those are the two main functions. 
 
        
                    
             
        
        
        
Answer:
Ideally, the experimental and control groups are identical. As much as possible, the two groups should overlap in every characteristic.
Explanation:
At the beginning of your study, you need your two groups to be as statistically similar as is humanly possible. That way, when you control for other variables, you can reasonably attribute any statistically significant differences at the end of the study to your intervention. 
 
        
             
        
        
        
Make a box with four sections and put TT Tt TT Tt above them I think