A temperate grassland biome has a gross primary productivity of 3,480kilocalories/meter2/year and a net primary productivity of 2,000kilocalories/meter2/year. Which of the following is the approximate number of kilocalories/meter2/year available to herbivores in that biome?
a) 200kilocalories/meter2/yearb) 1,480kilocalories/meter2/yearc) 2,000kilocalories/meter2/yeard) 5,480kilocalories/meter2/year