Aspecies can develop genetic diversity
immediately
over a short period of time
over a long period of time
over any period of time

The answer is "Over a Long Period of Time".

 I know cause I took the test the only choices was A and C. So you can illiminate b and d.

  Trust me it is C.

       You are So Welcome.

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.    

true, i don't really know what you're asking but from the info you provided im guessing the answer is true.