Apply: matter and energy in food webs

A food web from a desert ecosystem. Arrows point from the cactus to the desert woodrat, from the cactus to the coyote, from the coyote to the fungus, from the desert woodrat to the kit fox, from the kit fox to the coyote, from the kit fox to the the fungus, from the creosote bush (plant) to the desert iguana, and from the desert iguana to the kit fox. The arrow from the cactus to the coyote is labeled 1. The arrow from the kit fox to the fungus is labeled 2. The arrow from the desert iguana to the kit fox is labeled 3.