Final answer:
An oval cross section of an adult femur suggests that the individual was likely physically active, as bones remodel in response to the physical stresses they endure from such activity.
Step-by-step explanation:
An oval cross section of an adult femur often reflects the levels of physical activity of the individual. In the context of skeletal anatomy and biomechanics, the shape and structure of long bones like the femur can be indicative of the mechanical stress they�ve undergone. These stresses are typically the result of physical activity, where the bone remodels and adapts to the forces exerted upon it.
An oval cross section suggests that the bone has been subjected to bending and torsional stresses, which are consistent with a physically active individual. This adaptation allows for a more efficient distribution of weight and force during movement, which is a necessary trait for someone engaging in regular strenuous activity. Therefore, when one observes an oval femur, it would be reasonable to infer option (a): the individual was likely very physically active.
It is important to recognize that skeletal remains can provide a wealth of information about a person's lifestyle, health, and even cause of death. Studies in osteology (the study of bones) can reveal patterns of wear and remodeling that indicate certain types of activity or inactivity. Thus, an oval femur cross section can be quite telling in an archaeological or forensic context.