I would say that this is the first law of thermodynamics.
I believe that this question has the following choices to
choose from:
placer deposits
fossil compaction
hydrothermal solutions
igneous processes
Actually among all, I have never encountered an ore that
formed due to fossil compaction. I suppose we can get minerals such as marble
or lime but not ores. So the answer is:
<span>fossil compaction (answer)</span>
His role as a field research is that of a: Complete participant!
(Option D.)
~Good luck!
Hope this helps. If you need clarification just ask me!