Hand Gestures are ESSENTIAL
visual aids are great if possible
short simple sentences so easier for the audience to understand
clear loud voice, make sure you are aware of the intent behind your voice - is it to persuade (loud projecting booming persuasive), create sympathy (quiet, urging) etc etc.
Well, in this sentence the subject is 'he', I think you gave us the wrong options here. :S
Astronomy is a field where one looks into the great expanse of space and tries to find something that will bring the world a little closer to fully understanding the universe.
They're similar but they aren't the same. satire is a comedic way of making fun of something. Sarcasm is a way of stating wrong information in a way that is obviously not true.
