The answer is:  "dopamine" .
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It is called a contusion. Hope this helps.
        
             
        
        
        
Answer: C. A substrate
Explanation:
 
A substrate is a substance on which an enzyme act. The enzyme acts on substrate X and converts it to Y.
 
        
             
        
        
        
Answer:
because bill stacy was sick.
Explanation:
 
        
             
        
        
        
Answer:
Primary succession takes place over a long period of time on newly formed land, while secondary succession occurs quickly in areas that have disrupted by a natural disaster
Explanation: