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A rigid substance on the outside of certain cells, usually plant and bacteria cells.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
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A cell wall is a rigid substance on the outside of certain cells, usually plant and bacteria cells.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref>
    
==References==
 
==References==
 
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