Well there are many kingdoms that include animals that can live in these conditions. (The kingdom classification system, by the way, is somewhat dated. I recommend you research modern taxonomy.) There are certain species of fish which survive year-round in the arctic, and other species of fish which live on the ocean floor, and still more which can survive near geothermal vents and in hotsprings, so the Animal Kingdom. However, Archaea, a domain of organisms distinct from eukarya and bacteria (basically, everything else) contains organisms similar to bacteria which thrive in basically every extreme and can be found almost anywhere. These organisms are know as extremophiles.
Stable ocean conditions and temperatures contribute to a more predictable and consistent marine environment. Organisms that rely on specific conditions for survival are likely to thrive in these stable ocean conditions. However, sudden changes in ocean conditions or temperatures can disrupt the balance of marine ecosystems.
Most of Earth's photosynthesis is carried out in the ocean by organisms in the Protist Kingdom: seaweed, diatoms, etc.
Ocean's Kingdom was created in 2011.
Scientists refer to the organisms that live below the bottom of the ocean as extremophiles, which are organisms that thrive in extreme environments. These organisms have adapted to survive in conditions such as high pressure, darkness, and extreme temperatures that are present in the deep sea.
Bacteria are found in the Kingdom Monera. The 6 Kingdom system includes Animalia, Plantae, Fungi, Protista, Archaea, and Bacteria.
Ocean temperatures change on a seasonal basis, but there are other factors at play which complicate when, and how, and by how much it changes.
The Atlantic Ocean
temperatures don't vary.
Organisms that drift with the ocean's currents include plankton, jellyfish, and larvae of marine organisms. These organisms rely on ocean currents for transportation, dispersal, and feeding opportunities as they move through the water column.
almost 90% of organisms in the ocean live in the uppermost zone
the Atlantic ocean
Organisms that live in the bottom of the ocean include deep-sea tube worms, anglerfish, sea cucumbers, deep-sea octopuses, and various types of bacteria and microorganisms. These organisms have adapted to survive in extreme conditions such as intense pressure, cold temperatures, and lack of sunlight.