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==Key Stage 3==
===Meaning===
[[File:ToxicSymbol.png|right|300px|thumb|The symbol for [[Toxic]] [[chemical]]s.]]
A [[toxic]] [[substance]] is one that is so poisonous it could kill a [[human]].
===About Toxic Chemicals===
: Some [[chemical]]s are [[toxic]] in very small quantities so even a small amount could kill an [[organism]].
: Some '''toxins''' must be ingested to kill the [[organism]]. However, some can kill an [[organism]] if they are [[inhale]]d or if some of the [[chemical]] gets on their [[skin]].
==Key Stage 4==
===Meaning===
[[File:ToxicSymbol.png|right|300px|thumb|The symbol for [[Toxic]] [[chemical]]s.]]