Final answer:
A large region with similar climate and biotic factors, like the Temperate Deciduous Forest, is classified as a biome in ecological organization.
Step-by-step explanation:
The ecological level of organization that corresponds to a large region with a similar climate and biotic factors, such as the Temperate Deciduous Forest, is termed a biome.
A biome is a classification for areas of the planet that share common climatic conditions and dominant plant types, which in turn influence the types of animals that reside there.
Biomes, such as tropical rainforests, deserts, and grasslands, encompass a variety of ecosystems within them that contribute to the overall diversity of the biome.