compositions of dietary sulfur, since cysteine values are impacted by diet and internal cycling. While other stable isotope systems have significant trophic shifts, there is only a small shift (~0.5‰) observed between the δ34S values. Consumers yield isotopic signatures that reflect the sulfur reservoir(s) of the dietary protein source. These characteristic values are determined by the isotopic nature of sulfate in the environment. Animal proteins sourced from marine ecosystems tend to have δ34S values between +16 and +17‰, terrestrial plants range from -7‰ to +8‰, and proteins from freshwater and terrestrial ecosystems are highly variable. The sulfate content of the modern ocean is very well-mixed with a δ34S of approximately +21‰, while riverine water is heavily influenced by the sulfur-bearing minerals in surrounding bedrock and terrestrial plants are influenced by the sulfur content of local soils. Estuarian ecosystems have increased complexity due to seawater and river inputs. The extreme range of δ34S values for freshwater ecosystems often interferes with terrestrial signals, making it difficult to use the sulfur system as the sole tool in paleodiet studies. Various studies have analyzed the isotopic ratios of sulfur in mummified hair. Hair is a good candidate for sulfur studies as it typically contains at least 5% elemental sulfur. One study incorporated sulfur isotope ratios into their paleodietary investigation of four mummified child victims of Incan sacrificial practices. δ34S values helped them determine that the children had not been eating marine protein before their death. Historical insight coupled with consistent sulfur signatures for three of the children suggests that they were living in the same location 6 months prior to the sacrificial ceremony. Studies have also measured δ34S values of bone collagen, though the interpretation of these values was not reliable until quality criteria for the analysis was published in 2009. Though bone collagen is abundant in skeletal remains, less than 1% of the tissue is made of sulfur, making it imperative that these studies carefully assess the meaning of bone collagen δ34S values. Archaeological uses of DNA aDNA analysis of past populations is used by archaeology to genetically determine the sex of individuals, determine genetic relatedness, understand marriage patterns, and investigate prehistoric population movements. An example of Archaeologists using DNA to find evidence, in 2012 archaeologists found skeletal remains of an adult male. He was buried under a car park in England. with the use of DNA evidence, the archaeologists were able to