Which of the following is an example of a flat bone?

The sternum is classified as a flat bone due to its thin, flattened shape and broad surface area. Flat bones typically have a protective function and include structures such as the skull, ribs, and the sternum. These types of bones provide extensive areas for muscle attachment and serve as barriers to protect internal organs.

In contrast, the humerus and femur are categorized as long bones, which have a greater length than width and are primarily involved in movement and support. The vertebrae are classified as irregular bones due to their complex shapes that do not fit into the other categories of bone classifications. Understanding these classifications helps in recognizing the diverse structures and functions of bones within the human skeleton.