1) Annotate or explain the figure below in detail. Some things you will want to include or consider: What kind of plot is this? What type of data is it showing? What are the axes? What are the units? What do the labeled lines represent? 2) Use this figure to explain why the concentration of oxygen decreases with depth before any other element or compound. 3) What are the factors that influence how deep oxygen persists into the sediment? 4) Based on this figure, what type of reaction is energetically the LEAST favorable?.