There are different kinds of theory. Spontaneous generation is included in the idea of abiogenesis, an hypothesis stating that life began in the absence of life.
This is simply known as the notion or theory that state that life emerges from nonlife for approximately more than 3.5 billion years ago therein on Earth.
The example of abiogenesis are;
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abiogenesis
-biogenesis
-germ origin of disease
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