The layer of the interior where the temperature drops from 7,000,000c to 2,000,000c is a. core b. radiation zone c. convection zone

Explanation:

This zone is place between the inner core and the outer convective zone. Its temperatures decay from 7 million to 2 million across this zone.

Through this layer, energy is transported to outside the stars, and involves radiative diffusion process. All these energy travels in form of photons, which you can imagine like energy packages that are transported in the electromagnetic waves.

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.    

i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.