5.You are doing an experiment involving the gain in mass of rats given different amounts of 
       
      
                
     
    
    
    
    1  answer:
            
              
Answer: 
The independent variable are the vitamins .
The dependent variable are the rats.
Explanation: 
The vitamins are the independent variable because they are are controllable. You can control how many vitamins the rats will be given.
 
                                
             
         	
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