Science March 2012 Crossword
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
                   
 
 
Down: 1) a relationship between two kinds of organisms that benefits both2) a relationship between two kinds of organisms that benefits one without harming the other4)  Across: 3) a characteristic that enables a living thing to survive in its environment5) a relationship in which one organism lives in or on another organism and benefits from that relationship while the other organism may be harmed by it.6) anything that controls the growth or survival of a population7) a relationship between two kinds of organisms that lasts over time
 

 

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