Why are two different deserts each on a separate continent considered to be the same biome?

Two different deserts on separate continents are considered to be the same biome because they share similar climatic conditions, such as low precipitation, high evaporation rates, and extreme temperature variations. These factors create analogous ecosystems despite geographical separation, leading to comparable flora and fauna adaptations. The classification of biomes is based on these shared environmental characteristics rather than specific location, allowing for a broader understanding of ecological patterns worldwide.