A view of a sea urchin observed with an underwater camera at the Gulf of Izmit and Gokova in Kocaeli, Turkiye on September 5, 2023. Sea urchins, are determinant species of the marine ecosystem, with about thousand species in the world's seas. The main food source of sea urchins is algae. These determinant species cannot live in poor water conditions as they are known for being food for many creatures in marine life. (Photo by Tahsin Ceylan/Anadolu Agency via Getty Images)
