<unk>  can mean the<unk> ity of a substance, possibly in relation to a specific organism and<unk>  can mean the<unk>  of an organism, organic system or ecosystem to contain a<unk>  substance or a selection of<unk>  substances (a compound) without showing signs of poisoning or dying.
Toxic capacity
Biological half-life
Modes of toxic action
Measures of pollutant concentration
Dose 
Absorbed dose
Oat sensitivity
Effective dose 