| − | A [[chemical]] secreted by a living [[organism]] that kills or reduces the reproduction rates of other organisms.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> | + | A [[chemical]] secreted by a living [[organism]] that kills or reduces the reproduction rates of other organisms.<ref>Wile, Dr. Jay L. ''Exploring Creation With Biology''. Apologia Educational Ministries, Inc. 1998</ref> Antibiotics gradually lose effectiveness when used by an individual, as the strain of antibiotics infecting the individual evolves to become resistant to the antibiotic.<ref>http://www.chemheritage.org/educationalservices/pharm/antibiot/readings/evolve.htm</ref> |