D. Strong ....................
The question is asking to state what would be a nucleotide made of, and base on my research and further investigation, I would say that the answer would be a Nuclei Acid. I hope you are satisfied with my answer and feel free to ask for more if you have questions and further clarifications
I think A is the youngest layer, because of the new sediments that fell upon the animal.
The correct answer is letter B, burning wood. This is not a renewable resource of energy as its by-product involves the release of greenhouse gases that can still be harmful to the atmosphere or to the environment in general. All the other choices are good sources of renewable power because they harness the power of naturally occurring materials found in their space.