In an anatomy class a student has been learning about bones of the body while taking a test he needs to identify the sternum which is a thin flat bone with bumpy edges

I believe this is the answer

Explanation:

The term “flat bone” is somewhat of a misnomer because, although a flat bone is typically thin, it is also often curved. Examples include the cranial (skull) bones, the scapulae (shoulder blades), the sternum (breastbone), and the ribs. Flat bones serve as points of attachment for muscles and often protect internal organs.

which time period is this? or is this story fictional, i'm going to need more info to answer this question

both include an amendment process.