Three of the most prominent definitions of species are the biological species concept, the phylogenetic species concept, and the morphological species (morphospecies) concept. drag each characteristic to the appropriate bin based on the species concept(s) to which it applies. view available hint(s) accommodates asexual reproductionnot applicable for extinct speciesused by scientists in classificationrelies on similarities in structurebased on evolutionary historyspecies acceptance criteria can be subjective biological morphological phylogenetic morphological and phylogenetic morphological, phylogenetic, and biological

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.    

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link: