A biome, also known as life zones, consists of all plants, animals, and other organisms, as well the physical enviorment in a particular area. A biome is characterized by its plant life, climate, and location. The climate and physical features determine the boundaries of a biome. A biome is made up of many different ecosystems. The ecosystems tend to have the same plants and animals as neighboring biomes around the boundaries.The oceans and seas form the marine biome, the world’s largest biome. It coversthree-quarters of the earth or 70 percent of the worlds area and reaches from the far northto the far south of the planet. Oceans are filled with salt water. Their climate stays thesame year round, so the creatures of the sea do not have to adapt to the changing seasons.There are five oceans: the Atlantic, Pacific, Indian, Artic, and Southern (Antarctic),although three of these: Atlantic, Pacific and Indian are regarded as the principal oceans. The Arctic Ocean is regarded by some researches as part of the Atlantic. The SouthernOces is really the southernmost part of the Atlantic and Pacific. It is bordered by thecontinent of Antarctica to the south, but has no land bordering it to the north. The oceansinclude seas- smaller expanses of marine waters. Among the largest seas are theMediterranean, Caribbean, Yellow, South and East China Seas, and the Sea of Japan.Near the poles, in the far north and south, the sea is always cold, and in the winter itssurface freezes. When water freezes, any substances dissolved in it are “squeezed out”from the ice. At the edge of the ice the sea is saltier than it is farther away. Salt water isdenser than fresh water because of the salt in it. Water also reaches it maximum density at39 degrees F, just above freezing. Cold water flowing toward the equator is replaced bywarmer water, and this exchange of water produces the principal ocean currents. Theyflow in approximate ...
