remains of dead organisms or cast-off material from living organisms (M2)


animal that feeds on organic materials on the seafloor (M2)


bacteria, fungi, and some animals that break down organic material; the term may be used to mean ‘decomposing bacteria,’ which break down organic material into its inorganic components (M2)

Coralline algae

marine plants that produce a calcareous structure similar to that created by corals (C1, M2)


a toxic substance produced by microscopic marine organisms called Gambierdiscus toxicus which blooms among and on marine algae (M2)

Cartilagenous fish

fish such as sharks and rays whose skeletons are largely composed of cartilage rather than bone (M2)