The answer is: Plasma.
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Animals cells are found inside the animals body. We have no exact place where it is found ;)
        
                    
             
        
        
        
The answer is B. Asteroids
        
             
        
        
        
Answer is: a secretary smokes a cigarette in a crowded break room.
External cost Is when consuming a good or servise imposes a cost to a third party. In this case, smoking affects other people in break room, causing pollution and health related problems.