The picture below shows a stable isotope biplot containing d…

The picture below shows a stable isotope biplot containing data from 3 elasmobranch species collected in southwest Florida: the cownose ray (Rhinoptera bonasus), the smalltooth sawfish (Pristis pectinata), and the bull shark (Carcharhinus leucas). Which of the following is the BEST interpretation of this graph based on the data shown?