Final answer:
The subtropical desert and the arctic tundra are similar in experiencing extreme temperatures and having low biodiversity. They have unique adaptations to survive in their harsh environments.
Step-by-step explanation:
The subtropical desert and the arctic tundra are similar in that both experience extreme temperatures and are characterized by low biodiversity. Both biomes have unique adaptations to survive in their harsh environments. The subtropical desert has high temperatures and low precipitation, while the arctic tundra has extremely low temperatures, little precipitation, and a short growing season. Examples of adaptations in the subtropical desert include cacti that store water and have spines to reduce water loss, while adaptations in the arctic tundra include plants that grow close to the ground to conserve heat and animals with thick fur or feathers for insulation.