Areference to another story or source within a written piece or speech is called a(n):
allusion
plagiarism
illusion
fable

I think the correct answer from the choices listed above is the first option. A reference to another story or source within a written piece or speech is called an allusion. It is a figure of speech that makes a reference to a place, person, or something that happened. Hope this answers the question. Have a nice day.

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.

According to arrhenius theory of acid and bases, an acid is a proton donor, while base donates hydroxyl ions. further, acid and base reacts to form salt and water.consider following example.hcl    +      h2o          →      cl-          +      h3o+here, hcl has donated a proton, hence it is an acid.now consider following reactionhcl      +      naoh            ↔      nacl      +        h2oin this reaction, hcl donates proton, hence it is acid. on other hand, naoh donates hydroxyl ion (i.e. hence it is a base.