Scientists divide the world into large natural areas called biomes. Desert and rainforest biomes are two that you’ve probably heard of. Each biome is known for certain kinds of plants and animals. But what’s really at the heart of a biome is its climate.ree An Introduction to Biomes Scientists divide the world into large natural areas called biomes. 900L-1040L Free Tundras It is crazy cold in the Arctic tundra. 900L-1040L Taigas The taiga is the world’s biggest biome.