What is the question that your asking??
Yes, "All teenagers are mean and smelly they really need to clean up their acts." is a run on sentence.
because, it is easier to use plants or things of that type other than using human trials which can be lethal if done wrong.
The phrase idiom is a phrase<span> or a fixed </span>expression<span> that has a figurative, or sometimes literal, </span>meaning.
Dramatic Irony is irony that is inherent in speeches or in a situation of drama and is understood by the audience but not grasped by the characters in the play.