Correct choice is (d) Response
Explanation: Response of an organism to a particular stimulus to measure the magnitude of the response, dose effect relationship is very important. Whereas, Toxicities is the result of several toxicants that can only be imposed if it is able to cross the several sub cellular structures, biochemical degradation is the degradation of bio-accumulated chemicals stored in the organism, whereas, sodium is the metals that can be found in an organism.