thebreakingofachemicalbondinacompound, producingparticlesorionsofoppositecharge, e.g. theformationofsodiumandchlorideionsinasaltsolution
2.
thedestructionofcellsorproteinsofonespeciesbytheactionofenzymesorlysinsfromanother, e.g. whenthebloodofonespeciescausestheredbloodcellsofanotherspeciestorupture