Which revision adds a narrative element to a historical essay? including background information that affected actions or events
including detailed information that makes the essay very specific
including new characters and events that support the essay topic
including transition words that make the story flow in order of the events

Ascientist performs an experiment where she measures the mass of a piece of metal, pours acid onto the metal, washes the metal, and then re-measures the mass of the metal. the scientist repeats the experiment several times, each time increasing the amount of acid used. the dependent variable in the experiment is the: initial mass of the metal final mass of the metal amount of acid used washing the metal