A constant factor could be the dose of the drugs  and the species of the rats used.
<h3>What is a constant factor?</h3>
In an experiment, a constant factor is one that is not allowed to change al through the experiment. This one must be held as the same and not allowed to vary. A constant factor could be the dose of the drugs  and the species of the rats used.
The factor that would be different for the experimental group and the control group  the administration of the new drug.
Learn more about experiment:brainly.com/question/11256472
#SPJ1
 
        
             
        
        
        
The answer is A.) Theoretic
        
                    
             
        
        
        
Enzymes are biological catalysts – they speed up chemical reactions. Enzymes are required for most of the chemical reactions that occur in organisms . These reactions occur in the breakdown of chemical molecules, which we see in the digestive system . ... Enzymes are proteins that have a complex 3D-shape.
        
                    
             
        
        
        
Answer:
to break down food into nutrients