What type of bone marrow predominantly contains fat cells and replaces red bone marrow with age?

Yellow bone marrow is the correct answer as it primarily consists of adipocytes, or fat cells, and plays a significant role in energy storage. Throughout a person's life, as they age, red bone marrow, which is responsible for producing blood cells, is gradually replaced by yellow bone marrow. This transition can be seen particularly in long bones, where the proportion of yellow marrow increases with age, reducing the amount of active blood cell production.

Red bone marrow is vital for hematopoiesis (the formation of blood cells), and while it is indispensable during early development and throughout childhood, it diminishes and is largely converted to yellow marrow in adults. Spongy bone refers to the porous inner structure of certain bones and is not specifically related to the fat content of the marrow. Compact bone is the dense outer layer of bone tissue and does not pertain to bone marrow composition.