To whom does macbeth refer when he says what seem'd corporal melted as breath into the wind

You have to look at the lines preceding the line in order to know who he is speaking of. 

Whoever it is apparently dissolved into thin air. Then you can see there is a stage direction that states "Witches vanish." This is who Macbeth is referring to when he makes that statement. 

as you read the passage below, consider how dana gioia uses

evidence, such as facts or examples, to support claims.

reasoning to develop ideas and to connect claims and evidence.

stylistic or persuasive elements, such as word choice or appeals to emotion, to add power to the ideas expressed.

explanation: