Answer: First there's Grass and when the grass grows Herbivore's eat the Grass and when the Herbivore's Grow older and bigger The predator kill's the prey and when the predator is done eating its prey Fungi eats its remains.
More Easy Explanation: Grass Grows and produces energy then Herbivore's come and eat the grass and get's the energy off that plant and then the predator kills the prey and takes the energy that was in the prey the fungi take the remain's of the prey and it happens again and again