Examples of autotrophs ( producers) are plants ,algae & autotrophic bacteria
consumers : In terms of animal life and the food chain or the food web, a consumer is an animal that consumes plants or other animals for the benefit of it's own use (i.e. bodily functions). Consumers include deer, wolves, bears, grasshoppers, hawks, etc.
the man it self considered a consumer
Fungi are the primary and common decomposers of litter in many ecosystems.
Worms, molds, fungus, bacteria, and actinobacteria are some general catagories of decomposers.