In the Temperate Deciduous Forest biome, there are around three levels of plants. Lichen, moss, wildflowers and other small plants are the first level. Shrubs occupy the middle level, and hardwood trees take up the last level. The Oak tree is one of those trees that do a lot more than sit and shade animals. As most people know, oak trees have acorns. This type of nut are essential for the lives of small animals like birds, squirrels, deer and other consumers. Without them, most of the population living in the biome, if not all would die off. So survival of the oak tree is vital for the population. A way that this oak tree protects itself from being destroyed by the cold winters in the forest is by developing thick bark which protects against these winters. With this, the oak tree will be able to survive and provide food and other necessities for the life in this biome.