What does the body of an informational article usually contain

They are written using special text features that allow the reader to easily find key information and understand the main topic. The author will do this by providing headers over certain sections, by placing important vocabulary in bold type, and by using visual representations with captions. These visual representations can be pictures, tables, diagrams ,chart or graph.

Walked would be the participle here. as it is a verb ending in -ed.