Energy is at the forefront of a variety of major global challenges currently faced by the entire world. Among these energy-related challenges include concerns with availability, reliability, costs, and security. However, it should be
noted that even though energy can be neither created nor destroyed, the global demand, due to societal needs
and wants for it, continues to increase; therefore, so do the associated global challenges and concerns.
The world's choices regarding energy sources and usage impacts the quality of both individuals and societies by
Impacting natural resource production and consumption
Impacting environmental quality
Impacting national security and economic systems
Answer choices A, B, and C

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.    

why do you want to cheat? i dont take it, so i dont know.

explanation:

some tips: get a tutor

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i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

the dark variety, as they are not visible on the dark tree barks

explanation: