Where does a sea turtle get the nutrients to grow

Vegetation. Seagrass, where fish, shellfish and crustaceans live, needs to be “mowed” by sea turtles in order to grow properly. When green sea turtles regularly graze on seagrass, the blades gain more nutrients and can thrive, rather than become overgrown and end up decomposing.

Ithink its the 3rd one