Which feature in a textbook can you read and study the material

The feature in a textbook that can help me read and study the material is a:

Conceptual map.

Explanation:

There are many features from textbooks that can help us study them and learn. However, Concept Maps help us to identify the main concepts of the topic and create a cognitive map to remember them, their meanings, and relationships. First of all, is like organizing the information in a scheme without all the words. To enhance the whole topic to deepen in each topic after having understood the topic as a whole.

the answer is   b suffix addition