What is the official term given to the harmful effects that a drug or chemical may have on an organism?

a. toxicity
b. harmful
c. lethal
d. baneful

A. Toxicity

Explanation:

Toxicity is the ability of some chemical substance or medication to generate harmful effects on a living being, by coming into contact with it. Toxicology is the area of study that is dedicated to the toxicity of substances.  

All substances have some degree of toxicity since any substance is capable of producing a toxic effect if a sufficient dose is administered. All substances are toxic; however, some are toxic to a greater degree compared to others.

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layer 3 is younger than layer 6.