Science williams Crossword
                 
                 
                 
                 
                 
                 
                 
                 
                 
                 
 
 
Down: 1) 2) an inherited trait that increases an organism's chance os survival3) air sacs within the lungs where gases are exchanged between the lungs and the blood Across: 3) any nonliving part of an ecosystem4) a form of immunity that develops from exposure to a pathogen5) a form of a trait carried by a gene
 

 

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