Spontaneous generation was never a valid scientific theory. For a more accurate one look at https://en.wikipedia.org/wiki/Abiogenesis https://en.wikipedia.org/

Spontaneous generation was never a valid scientific theory. For a more accurate one look at https://en.wikipedia.org/wiki/Abiogenesis https://en.wikipedia.org/wiki/Abiogenesis Also, the probablity of generation of organic compounds which are precursors to life is pretty high given right environment, https://en.wikipedia.org/wiki/Miller%E2%80%93Urey_experiment https://en.wikipedia.org/wiki/Miller%E2%80%93Urey_experiment