Biology is the study of life. The real question is what is life? Life consists of many different things. Producers, the ecosystem, consumers and decomposers all have a role in life. Each of these plays an important role in life, and this is how.

To begin with, producers are at the bottom, or primary level of the food chain, therefore all organisms higher on the food chain depend on them either directly or indirectly. No producer means no consumers. Plants play the most important part in the cycle of nature and life. Without plants, there could be no life on Earth. They are the primary producers that sustain all other life forms. This is so because plants are the only organisms that can make their own food. Animals, that are not able of making their own food, depend directly or indirectly on plants for their food supply.

Secondly, the ecosystem is essential to human life, providing us with countless and extremely valuable services. Human beings rely on a host of invisible services that ecosystems provide. For example: they provide foods, medicines and energy. The ecosystem services are the goods and services that come from natural and managed ecosystems which are important for the sake of human welfare, and it includes everything from clean air and water to food and fuel.

Also, an ecosystem can exist without consumers but it cannot be sustained without decomposers. Consumers get their energy from the producers or from organisms that eat producers; they are an