The flowchart below illustrates the steps involved in root nodule formation. the first step has been filled in to get you started. complete the rest of the chart. first, drag the white labels below the images, indicating what happens at each step. then, drag the blue labels to the blue targets, indicating the plant gene functions that must be active at each step. not all labels will be used.

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.    

substitution is the answer in this case