Worms have been found in rocks at the bottom of a diamond
mine; bacteria has been found deep in volcanic rock.
The theory of spontaneous generation originated with
Aristotle, who wrote that the “vital heat” contained
in air and water was responsible. Needham exposed his broths to
air as they cooled after boiling (insufficiently to kill microbial
endospores in the broths), not imagining that air could contain
microbes and microbial endospores responsible for what he thought
were generated spontaneously.
Apes and chimpanzees have been found to
“self-medicate” by eating particular astringent leaves
and inner barks to cure themselves of malaria and worms.
See also in The book of science:
Readings on wikipedia: