Which correctly describes how the first life on earth could have occurred by spontaneous generation

Spontaneous generation refers to an obsolete body of thought on the ordinary formation of living organisms without descent from similar organisms. The theory of spontaneous generation held that living creatures could arise from nonliving matter and that such processes were commonplace and regular. 
The doctrine of spontaneous generation was coherently synthesized by Aristotle,[2] who compiled and expanded the work of earlier natural philosophers and the various ancient explanations for the appearance of organisms, 

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