Actinobacteria sp. are fermenting organisms (which do not use oxygen to breathe) referred to as chemoorganohetereotrophs. this means they break down organic material and convert it to inorganic material. which part of the carbon cycle does this describe?
photosynthesis
respiration
decomposition
assimilation

The answer is decomposition.
The process by which organic material is broken down into inorganicmaterial is known as decomposition.It's the last step in the carbon cycle, which is a process of recycling carbon atoms on Earth:- Carbon is released into the atmosphere as carbon dioxide from respiration.- Producers (plants) absorb carbon dioxide and make carbohydrates in photosynthesis.- Consumers (animals) eat producers and intake these carbohydrates.- After the death of both producers and consumers, decomposers (such as Actinobacteria, or other bacteria or fungi)eat that dead organisms and carbon are released into the environment.