It would be D) carbon dioxide (I took the test haha).
Head of state or chief of state...i think :)
Answer: throughout the duration of the speech
Explanation: if visual aid will be used during a presentation, it should be used throughout the entire presentation in order to help you explain information more concisely and coherently which makes the presentation easy for you and enables the audience to learn easily and flow with the presentation.
Answer:
we would be causing pollution
Explanation: