Here's why:
* Similes are figures of speech. They are stylistic devices used to create vivid imagery and comparisons.
* Structural features refer to the organization and arrangement of a text. They include things like:
* Paragraphs and sentences
* Chapters and scenes
* Plot structure
* Character development
Similes are used within the structure of a text, but they don't define the structure itself.
For example, you might have a paragraph describing a character's anger: "He was like a volcano about to erupt." This simile helps the reader visualize the character's emotion, but it doesn't change the structure of the paragraph.
In short, similes enhance the content of a text, but they don't determine its fundamental organization.