The inorganic and organic substances in all of the organisms will finally return to the environment by the action of decomposers.
What is the function of decomposers?
One of the critical role in the flow of energy via an ecosystem is done by the decomposers. They dissociate down the dead organisms into the basic inorganic substances, therefore, making nutrients accessible to the primary producers.
The decomposers feed on the animal carcasses and dead plant substances. They do a valuable function of cleaning the Earth. In the absence of decomposers, the dead plants and animals would get pile up everywhere.
Decomposers perform an essential role in making the essential nutrients accessible to the ecosystem of the primary producers. They dissociate down the complex organic components into the more elementary components like carbon dioxide and water.
Thus, the correct answer is option A, that is, decomposers.
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