What is one of the main functions of the skeletal system?

The skeletal system serves several critical functions, one of which is to provide a flexible framework for the body. This framework supports the body's structure and protects vital organs, allowing for movement in conjunction with the muscular system. Additionally, the skeletal system is responsible for the manufacture of red blood cells, a process that occurs mainly in the bone marrow within certain bones. This function is vital for maintaining adequate oxygen levels in the bloodstream and ensuring the effective transport of nutrients and waste.

In contrast, the other options listed do not accurately describe primary functions of the skeletal system. Producing hormones is primarily a function of the endocrine system. Storing energy is mainly associated with adipose tissue, not bone. Lastly, aiding in digestion is primarily related to the digestive system, where organs like the stomach and intestines play key roles. Therefore, the function of providing a framework and manufacturing red blood cells highlights the unique and essential contributions of the skeletal system to overall health and bodily functions.