Question

2 mark for review 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.

Explanation:

A null hypothesis is a statement of no effect or no relationship. The claim is that the synthesis of first organic molecules from inorganic precursors was possible due to the highly - reducing (low - oxygen) atmosphere on primitive Earth. The null hypothesis should oppose this idea by suggesting that oxygen levels do not matter for the synthesis. Option C suggests that organic molecule synthesis from inorganic molecules is possible under both current (high - oxygen) and primitive (low - oxygen) atmospheric oxygen levels, which is a null hypothesis as it negates the idea that the low - oxygen atmosphere of primitive Earth was crucial for the synthesis.

Answer:

C. The synthesis of organic molecules from inorganic molecules is possible under current atmospheric oxygen levels as well as those found on primitive Earth.