Marine growth is a term used to describe the collective organisms that live in the ocean. SEAWEED, CORAL, and ALGA are all examples of marine growth. SEAWEED is a type of algae that grows in the ocean and can be found in many shapes and sizes. CORAL is an animal that lives in the ocean and forms colonies that create reefs. ALGA is a type of plant-like organism that lives in the ocean and can range from single-celled organisms to large seaweeds. All three of these organisms are important components of the marine ecosystem.