Many scientists claim that the synthesis of the first organic molecules from inorganic precursors was possible because of the highly reducing atmosphere found on primitive Earth. Which of the following is an appropriate null hypothesis that could be used when investigating the claim? A. The level of atmospheric oxygen on modern Earth is significantly higher than on primitive Earth.
B. Organic molecules were transported to primitive Earth by a meteorite or other celestial event.
C. The synthesis of organic molecules from inorganic molecules is possible under current atmospheric oxygen levels as well as those found on primitive Earth.
D. The absence of a significant quantity of atmospheric oxygen is required for the synthesis of organic molecules from inorganic precursors.