I think the answer is either B. or D.
mark as brainliest!
Answer:
These are things that won't be going away. Natural gasses and fossil fuels will likely run out someday or become much harder to find. When you use these sources of energy, they won't be going away and therefore will be sustainable because we can always continue using them.
Does that make sense?
Explanation:
Protein synthesis in eukaryotic (plants and animal cells.) cells, occur in the ribosomes.
