Tundra
Did you know that, the Tundra biome is the largest of all biomes. And that under the snow and ice there is a thick layer of soil that remains frozen which does not allow deep rooted plants such as trees grow. Hints why there are not any trees in the Tundra biome. Also, when snow covers the Tundra, caribou often change their grazing behavior and move to warmer places for food.