The categories of organisms which are required for the cycling of matter in an ecosystem is missing is decomposer.
Decomposers are lifeform that disintegrate rotting or dead species; they carry out decomposition, a process only some kingdoms, like fungi, are capable of.
Each contributes to the food recycling process in a different way. To transform dead plants or animals into simple substances, fungi release compounds.
Some of these elements are absorbed by them for growth, while others go into the soil. As they ingest dirt, earthworms break down decaying plant and animal debris.
Decomposer is one of the kinds of creatures that is necessary for the cycling of matter in an ecosystem but is absent.
Thus, the missing organisms are decomposers.
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