Answer:
1) The ability to burrow under sand to protect themselves from heat
2) Adaptations to conserve water
Step-by-step explanation:
Many animals have adapted to dessert biomes by burrowing under the sand to protect themselves from the heat. This ability would be useless in a tundra biome because it is very cold. To maintain homeostasis animals in the tundra biome often have thicker fur to keep themselves warm.
Another adaptation in the dessert biome is to conserve water. Plants and animals such as camels have structures to help them conserve water. For example a cactus stores the water from rain in its stem and a camel is able to save water in their hump. There are very little plants in the tundra biome, but this adaptation would be unnecessary for them.