As the text is not included in the question, it is not possible to know what it refers to. However, we can still try to figure out what structure means, and how we can identify one.
There are five types of structures that are mostly used in texts. These are:
Description: In this structure, the author presents a topic and describes its characteristics, but does not criticizes it or judges it.
Sequence: This occurs when the author talks about a series of events in the order in which they happened.
Cause and effect: This takes place when an author describes an event, and links it with the consequences that this event had.
Compare and contrast: In this type of structure, the author talks about two or more subjects and compares them to see their similarities and differences.
Problem and solution: A problem and solution structure presents a particular conflict and then describes how this was resolved.