Migration and hibernation are examples of adaptations used by animals in the Arctic tundra. It is also physical adaptations.
Ex. of animal adaption: During the summer, brown bears behavior is to eat about anything they can find. Then they hibernate, or sleep during the Winter. The bear's physical adaptation allows the food eaten during the summer to be store as a layer of fat under it's skin. Another example of physical adaptation is used by the musk ox because he grows two layers of fur. One short, and around the back, and long fur around it's stomach and head.
Ex. of Plant Adaptation: Some plants grow close together and low to the ground and it helps the plants not freeze, and less damage is caused by the impact of ice and snow.