An ocean is a large area of salt water between continents. Oceans are very big and they join smaller seas together. Together, the oceans are like one “ocean”, because all the “oceans” are joined. Oceans (or marine biomes) cover 72% of our planet. The largest ocean is the Pacific Ocean. It covers 1/3 (one third) of the Earth’s surface. Big and small fish of different types are found in oceans. Crabs, starfish, sharks, whales etc are found in oceans.
White-spotted puffers are often found in seagrass areas.
Organisms that live in oceans can live in salt water. They are affected by sunlight, temperature, water pressure, and water movement. Different ocean organisms live near the surface, in shallow waters, and in deep waters. Small plant organisms that live near the surface and use sunlight to produce food are called phytoplankton.
Giant kelp is common along the coast of the eastern Pacific Ocean, from California north to southeast Alaska, and is also found in the southern oceans near South America, South Africa, Australia, and New Zealand. Individual algae may grow to more than 60 meters (200 feet) long at a rate of as much as 60 cm (2 ft) per day. Giant kelp grows densely as kelp forests, which are home to many marine animals that depend on the algae for food or shelter.
(edited from – source)