Given this diagram after reading the section...

• Generate a graph (and bring it to class) that displays the changing concentration of molecular oxygen in the atmosphere.   Facts to remember: the early earth had little or no free molecular oxygen in the atmosphere; today's atmosphere is ~20% molecular oxygen. 

• Q1: What assumptions did you make when constructing your graph.  What added information would you have liked to have?

• Q2: What did Wohler's synthesis of urea and the Miller/Urey experiment actually prove, versus what did they imply? 

• Q3: If thermodynamics tells us that all systems become more disordered over time, does life speed up or slow down this process?

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