The structure of a speech is vital to its success.

No.

Explanation:

The deaf, who cannot hear are not less human or less successful, it merely take longer for them to communicate in a world that identifies different as "bad" and those who are born mute have no control if they cannot speak but understanding language and being able to express yourself is something they are in fact still capable of doing.

can you tell me what is it

c) troops march forward in close formation against newer, more accurate weapons