Evolution Trivia Quiz

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2. Emergence

Most biologists accept that life originated spontaneously from carbon-rich substances interacting under influences like heat or radiation that are favorable for chemical reactions. In the 1920s, Oparin and Haldane proposed that the atmosphere of the young Earth, rich in methane and ammonia but poor in oxygen, provided the right conditions for life to take hold. Just one problem with that, however:

Click the response (A to D) you think is correct.