In the [[context]] of [[biology]], [[poison]]s are substances that can cause disturbances to organisms, usually by [[chemical]] reaction or other activity on the [[molecular]] scale, when a sufficient [[quantity]] is absorbed by an organism. Legally and in hazardous chemical labelling, poisons are especially toxic substances; less toxic substances are labelled "harmful", "irritant", or not labelled at all. | In the [[context]] of [[biology]], [[poison]]s are substances that can cause disturbances to organisms, usually by [[chemical]] reaction or other activity on the [[molecular]] scale, when a sufficient [[quantity]] is absorbed by an organism. Legally and in hazardous chemical labelling, poisons are especially toxic substances; less toxic substances are labelled "harmful", "irritant", or not labelled at all. |