Answer: The correct answer for the blank is- C. biomes.
Savanna is considered a transitional biome because it is intermediate between two biomes that are tropical rain forest and desert biomes.
There is a low tree density ( widely spaced trees) in this biome that makes the canopy open so that sufficient amount of sunlight can penetrate these biome.
The cimatic conditions are in this biome as majority of the precipitation is confined to one particular season, which is then followed by a season of draught.