2007-06-01 21:21:19 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Diseases are caused by microorganisms. Koch had postulates to prove this. If you took a disease and isolated the causative agent, all organisms with the causative agent must display all symptoms. Then you isolate the bacteria and grow it and then introduce it to a healthy individual. If the individual show all the symptoms that is what is causing the disease.
2007-06-01 21:53:46 · answer #1 · answered by actor_kyle 2 · 0⤊ 1⤋
About the origin of microorganisms? The germ theory refutated the concept of spontaneous generation, which was the idea that living things could arise from non-living things. Pasteur demonstrated that microorganisms are present in air but not created by air. His experiments showed that exposure of sterilized broth to air resulted in contamination of broth by microorganisms. In this way, Pasteur had both refuted the theory of spontaneous generation and convincingly demonstrated that microorganisms are everywhere - even in the air, which was critical for the development of the germ theory of disease.
2007-06-02 01:42:29 · answer #2 · answered by Niotulove 6 · 1⤊ 0⤋
Simply ... microorganisms come from pre-existing microorganisms.
2007-06-02 02:41:45 · answer #3 · answered by ecolink 7 · 0⤊ 0⤋