You searched for: “ocean habitat
ocean habitat (s) (noun), ocean habitats (pl)
A place where ecosystems are found at all levels, from the sunlit surface areas down to the deepest existence of life under water: "The ocean habitats cover about two-thirds of the Earth and support many kinds of life forms from the microscopic planktons to the blue whale, which is the biggest living mammal."
This entry is located in the following unit: Habitats for the Living (page 1)