Lana is studying the lumbar, or lower back, area of the body. She is trying to learn the names and locations of the organs in this area. Lana is studying the
of
Ophysiology, an organ system
gross anatomy, an anatomical region
O superficial anatomy, an anatomical region
O body cavity, an organ system

gross anatomy, an anatomical region

Explanation:

Anatomy can be grouped into gross anatomy and superficial anatomy. Gross anatomy is the study of structures that are visible to the human eye i.e. without the aid of a microscope. The anatomical regions are those regions in the body that are easily seen by the unaided eye.

In this case, Luna is trying to study the name and locations of the lumbar, or lower back, area of the body. The lumbar is the vertebrae found at the lower back of the body. Hence, it is an easily visible internal structure when dissected, making it's study a form of GROSS ANATOMY.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.

a covalent bond, specfically triple bond