Francesco Redi, who demonstrated that maggots were the offspring of flies, not products of spontaneous generation. (b) John Needham, who argued that microbes arose spontaneously in broth from a “life force.” (c) Lazzaro Spallanzani, whose experiments with broth aimed to disprove those of Needham.
The concept of biogenesis is well explained by Francesco Redi with his experiment where he demonstrated that maggots only develop on a meat when the meat has been in contact with the flies. On the other hand, the concept of abiogenesis or spontaneous generation is explained by John Needham with his experiments where microbes developed on a broth after it was brieftly boiled.