The figure shows a simplified nutrient cycle.
What types of organisms are X, Y, and Z?
Aerobic bacteria in the soil play an important role in decomposition.
What will happen to the decay process if the oxygen levels in the soil decrease due to waterlogging?
What can form if very low oxygen levels persist in the soil for a long period of time?
Fill in the blanks: Decomposers transfer nutrients from the parts to the parts of an ecosystem.