Final answer:
The approximate number of kcal/meter^2/year available to herbivores in a temperature grassland biome is 1,480 kcal/meter^2/year.
Step-by-step explanation:
The approximate number of kcal/meter^2/year available to herbivores in a temperature grassland biome can be calculated by subtracting the net primary productivity from the gross primary productivity. In this case, the approximate number of kcal/meter^2/year available to herbivores would be 1,480 kcal/meter^2/year (3,480 - 2,000 = 1,480).