What Non-Fiction Text Feature tells the reader that a word is important to the topic of the text?

Look at the image, this is an example of a...

What text features tells what the text will be about and introduces readers to the topic of the text?

This text feature shows how something works or explains something in a visual way. It labels the different parts of something.

This text feature gives interesting facts or extra information about the topic. The red box in the picture is an example of this.

This text feature shows the order that events happened.

This text feature is usually found in the back of a book and tells the definitions of some of the words found in a text. The image shows an example of this.

This text feature lists (in alphabetical order) where we can find specific information and topics in a text. This image is an example of this.

This text feature is used to tell the reader what a specific passage or paragraph within the text will be about. The image shows an example of this text feature