Final answer:
Temperature and precipitation are the two most important characteristics in determining the distribution of a biome.
Step-by-step explanation:
The two characteristics that are the most important in determining the distribution of a biome are temperature and precipitation. These abiotic factors influence the type of plants and animals that can survive in a particular biome. For example, a tropical rainforest biome has high temperatures and heavy rainfall, which allows for the growth of lush vegetation and a high diversity of animal species.