____________ break down droppings and decaying organic debris, eventually releasing these elements for nutrient cycling or utilization by other living creatures.

The correct answer is: Decomposer

• Decomposers are organisms that feed on the dead and decaying materials for diet
• They help to clear the environment from accumulation of dead and decaying matter
• The decomposition of the organism materials helps to release nutrients back to the environment 
• Bacteria, fungi are common examples of decomposers