Differences between tropical forests and tundra (alastairang)

Differences between tropical forests and tundra  

Tundra is located on earth's poles, which receive little sunlight making it extremely cold.  Little vegetation can become established because of the permafrost that prevents root systems, as well as the winds that clear miles of open land.  In contrast, topical rainforests receive direct and constant sunlight, which evaporates large amounts of water into the atmosphere only to drop back down again.  Though rainforests only occupy 3% of the earth, it contains over half of the worlds species - the most diverse biome in the world.