Only the water of marine ecosystems contains dissolved salt.

It is indeed true that only the water of marine ecosystems contains dissolved salt. Marine ecosystems, also known as salt water ecosystems, are aquatic ecosystems that waters harbor a substantial volume of dissolved salts. Definite features of individual salt water ecosystems differ significantly, however knowing their total basic surfaces gives an extensive image of their role, value and function. Furthermore, there are so many types of salt water ecosystem, the open ocean is not the only one. Other types include tidal zones, shorelines, estuaries, mangroves, coral reefs, salt marshes and swamps, hydrothermal vents and the ocean floor, just to name a few of the more main groups.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.