what are two primary decomposers
fungi and........
It would depend on what is decomposing.
See these sites:
http://www.google.com/search?hl=en&source=hp&ie=ISO-8859-1&q=two+primary+decomposers&btnG=Google+Search
See these sites:
http://www.google.com/search?hl=en&source=hp&ie=ISO-8859-1&q=two+primary+decomposers&btnG=Google+Search