Answer:
Two structures used in the text are:
descriptions and sequences.
Step-by-step explanation:
The reasons backing this answer are that in the first place descriptions are made to explain certain topics or provide information so that the reader can understand the perspective of the author. Also, the sequence is a progressive order that the author established to communicate his ideas so they can be understood by the author. In other words, the author is going to deliver information progressively according to the state of the development o the description it does.