Living things remove materials from the environment for growth and other processes. These materials are returned to the environment either in ____ materials or when living things die and ____. Materials decay because they are broken down (____) by ____. Microorganisms digest materials faster in ____, ____ conditions. Many microorganisms are also more active when there is plenty of ____. The decay process releases substances which ____ need to grow. In a ____ community, the processes which remove materials are balanced by processes which ____ materials. The materials are constantly ____. By the time the microorganisms and ____ feeders have broken down the waste products and dead bodies of organisms in ecosystems and cycled the materials as plant nutrients, all the ____ originally captured by green plants has been transferred.

Decomposition

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