Decomposers are the organisms which feeds on dead and decaying matter. Earthworm and bacteria are included under decomposers.
What are Decomposers?
Organisms that feeds on dead or decaying organisms and return organic material again to ecological cycle.
These are also called as detritivores. If decomposers gets vanished from ecology then it will result in stopped recycling of carbon and hence affect percentage of carbon dioxide in environment.
Some organisms that comes under this category are bacteria, earthworm, fungi, invertebrates, some insects etc.
Thus, the correct options are b and c.
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