Answer:
Two adaptations that could be useful for organisms that live in a desert biome but not in a tundra biome are:
1. Water Storage - Organisms in the desert biome need to be able to store water to survive long periods of drought. They can do this by having specialized organs or tissues that can store water for long periods of time. This adaptation is not necessary in the tundra biome because there is usually an abundance of water.
2. Nocturnal Behavior - Organisms in the desert biome are often active at night when the temperature is cooler and the risk of dehydration is lower. This adaptation allows them to conserve water and avoid the hottest part of the day. This adaptation is not necessary in the tundra biome because the temperature is usually cold throughout the day and night.