Based on the bones that you listed, it is likely that there is only one human buried at this site.
In humans, there are typically 20 ribs (10 on each side), 24 vertebrae (7 cervical, 12 thoracic, 5 lumbar, and 1 sacral and 1 coccygeal), 2 hyoid bones, and 14 phalanges in each hand and foot (for a total of 56 phalanges).
If an anthropologist finds 20 ribs, 24 vertebrae, 2 hyoid bones, and 6 phalanges at a burial site, this suggests that there is only one human buried at the site, because these bones all come from a single human skeleton. It is unlikely that the bones from multiple individuals would be mixed together in this way, unless the individuals were buried together and their bones became commingled over time.
In general, anthropologists can use the bones that are found at a burial site to determine how many individuals are buried there, as well as other information about the age, gender, and general health of the individuals. By carefully analyzing the bones and other physical evidence, anthropologists can gain insights into the lives and cultures of past human populations.
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