Answer:
In ecosystem, plants are the producer which prepare their own food. This food is eaten by primary consumers such as deer and cow etc. These primary consumers are the food of secondary consumer such as lion and tiger etc. When they die, decomposers such as bacteria and viruses etc are feed on their body and releases nitrogenous materials which are used by the plants again to make their food.
These plants and some animals are eaten by humans for energy. If this cycle is disturbed, the whole ecosystem is badly affected including humans.
