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Many life forms that live at these depths have the ability to create their own light a unique evolution known as bio-luminescence. [citation needed] In the deep ocean, the waters extend far below the epipelagic zone, and support very different types of pelagic life forms adapted to living in these deeper zones. [67]
Species of this genus inhabit the Pacific Ocean, the southwestern Atlantic Ocean and the southeastern Indian Ocean; also in the cold waters off Patagonia, Tierra del Fuego, the Falkland Islands and the South Shetlands.
Marine invertebrates are invertebrate animals that live in marine habitats, and make up most of the macroscopic life in the oceans. It is a polyphyletic blanket term that contains all marine animals except the marine vertebrates , including the non- vertebrate members of the phylum Chordata such as lancelets , sea squirts and salps .
The term aquatic can be applied to animals that live in either fresh water or salt water. However, the adjective marine is most commonly used for animals that live in saltwater or sometimes brackish water, i.e. in oceans, shallow seas, estuaries, etc.
Altogether the ocean occupies 71 percent of the world surface, [4] averaging nearly 3.7 kilometres (2.3 mi) in depth. [27] By volume, the ocean provides about 90 percent of the living space on the planet. [4] The science fiction writer Arthur C. Clarke has pointed out it would be more appropriate to refer to planet Earth as planet Ocean. [28] [29]
The ocean is the body of salt water that covers approximately 70.8% of Earth. [8] In English, the term ocean also refers to any of the large bodies of water into which the world ocean is conventionally divided. [9] The following names describe five different areas of the ocean: Pacific, Atlantic, Indian, Antarctic/Southern, and Arctic.
The majority of siphonophores live in the deep sea and can be found in all of the oceans. [11] Siphonophore species rarely only inhabit one location. [11] Some species, however, can be confined to a specific range of depths and/or an area of the ocean. [11]
The word "habitat" has been in use since about 1755 and derives from the Latin habitāre, to inhabit, from habēre, to have or to hold.Habitat can be defined as the natural environment of an organism, the type of place in which it is natural for it to live and grow.