Final answer:
The biome with rainfall between 25 to 75 cm/yr, grazing animals, and warm summers is the temperate grassland, characterized by dominant grasses, periodic fires, and a lack of trees except near water sources.
Step-by-step explanation:
The biome characterized by rainfall between 25 to 75 cm/yr, grazing animals, and warm summers is known as the temperate grassland. This biome is dominated by grasses and herbaceous plants, a result of the moderate precipitation, periodic fires, and the presence of grazing animals.
The dense vegetation and fertile soils are attributed to the robust network of roots and rhizomes belonging to the grasses, contributing to the biome's structure and ecological dynamics. Due to the relatively lower precipitation, trees are scarce in temperate grasslands, predominantly found along rivers or streams where moisture is more readily available.