Final answer:
It is false that ancestry can be determined solely by visual observation of the skull's eye orbits; many cranial features are considered in this process, with the eye orbits just being one of the aspects examined by forensic anthropologists.
Step-by-step explanation:
The determination of ancestry based on visual observations of the skull, specifically with the eye orbits being the most useful of all the cranial features, is considered to be false. While the eye orbits, as part of the anterior view of the skull, do provide significant information about the individual, forensic anthropologists use a combination of cranial features in order to determine ancestry. These features include but are not limited to the shape of the nasal cavity, the presence of certain cranial landmarks such as the occipital bun, and overall cranial morphology. The practice of assessing personality traits from the shape of the skull, known as phrenology, is now recognized as a pseudoscience.