Like human teeth, shark chompers contain collagen, a type of protein
that includes different elements, such as nitrogen and carbon, that
animals get from their food. Although scientists can’t tell exactly what
an animal has eaten from analyzing its teeth, Burg Mayer’s team was
able to glean clues about the sharks’ diets and rankings as predators by
comparing different forms of nitrogen, called isotopes, between the two
dental sets. Higher nitrogen isotope values suggest that an animal is
feeding higher on the food chain—that is, more likely to be eating
carnivorous or herbivorous prey than plants.
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