Biomes are classified according to the predominant vegetation and characterized by adaptations or organisms to that particular environment.
*Aquatic biome: Can be broken down into two basic regions, fresh water and water like the ocean and etc. Fresh water is defined as having a low salt concentration usually less then 1%. Aquatic areas like the ocean cover about 3/4 of the earth.Marine algae supplys much of the worlds oxygen supply.
*Rain forest biome: There are 2 types of rain forest; temperate and tropical. Tropical rain forest are found closer to the equator while temperate are found around the coast in temperate zones. Today forest occupy about 1/3 of earths land territory. It also contains about 70% of the carbon present in living things.
Deserts biome: Deserts occur where there's less then 50cm of rain a year and cover 1/5 of the earths surface! Deserts can be classified in four major characteristics; Hot and Dry, Semiarid, Cold, and coastal.