What does yellow marrow primarily store?

Yellow marrow primarily stores fat, which serves as an energy reserve for the body. The storage of fat in yellow marrow is particularly important as it can be utilized by the body when energy sources are low. Additionally, yellow marrow is found in the central cavities of long bones and plays a supporting role in maintaining the bone structure, but its main function revolves around fat storage.

In contrast, other options such as blood cells are primarily produced in red marrow, which is distinct from yellow marrow. Minerals are stored in bone tissue but not specifically in yellow marrow. Oxygen is transported in the blood and is not stored in marrow. Thus, the identification of fat as the primary component stored in yellow marrow is accurate.