Read your information... Think about what you should agree... with create a planning sheet.. min of 5 paragraphs... DONT FORGET to add a counter claim at the end and swing the topic back to you. counter claims are not long either.
The answer would be a Semicolon i believe.
The main purpose of subheadings are:
They stand out because of their size and attract attention.
The scanner will stop to read them and continue scanning until the next subhead which they'll then read.
Dorothy informs him of this in Chapter 4.