Which of the following organisms will not bring about decomposition?

Spirogyra is an organism that will not bring about decomposition. Decomposition is a natural process that breaks down dead organisms and organic waste into simpler substances, such as carbon dioxide and water, which can be used by other living organisms. Decomposition is mainly carried out by decomposers, such as bacteria and fungi, that break down the dead matter into smaller compounds. Earthworms, bacteria, and fungi (such as molds) are decomposers that play a significant role in decomposition. However, Spirogyra is a type of algae that does not participate in the process of decomposition. Algae like Spirogyra are producers that produce their own food through photosynthesis and are not involved in breaking down dead organic matter. Therefore, Spirogyra is an organism that will not bring about decomposition, unlike earthworms, bacteria, and molds.