In nature,animals fed on each other.They become energy for other kinds.For food chain sun is the begining of everything, it's the endless energy source.It give it's energy to producer(grass) and primary consumer(grasshopper) with fedding on producer, it takes energy from it.And it becomes the food for secondary consumer(snake),gives its energy to it.Than,tertiary consumer(hawk) fed with secondary comsumer.These animals eaten by the other animals, again transferring energy and organic compounds from one animal to another.
This chain of energy transferring from one species to another can continue several more times, but it eventually ends. It ends with the dead animals that are broken down and used as food or nutrition by bacteria and fungi. As these organisms, referred to as decomposers, feed from the dead animals, they break down the complex organic compounds into simple nutrients. Decomposers play a very important role in this world because they take care of breaking down (cleaning) many dead material. There are more than 100,000 different types of decomposer organisms! These simpler nutrients are returned to the soil and can be used again by the plants. The energy transformation chain starts all over again.