Maybe you have heard of "toxic waste" or "toxic chemicals." The word "toxic" describes something that is not healthy but, instead, is poisonous. This is not the same as being "murderous," but it is the same as being "deadly." "Deadly" things are dangerous and harmful—as are toxic ones. "Toxins" are things that are harmful (or toxic) in this way.

Whenever two things are distinct, they are different from each other and cannot be confused with each other. For example, we could say, "Those two character traits are distinct. Some people can be angry without turning red." This means that turning red is something different than being angry. The best option among those provided is "separate", for this communicates the idea of being two distinct realities.