Theory of Biogenesis- Living things are created from other living organisms. There were three scientists who tried to prove this and the most successful was Louis Pasteur.
"The Swan Neck Flask" proved the theory of biogenesis as the bacteria settled in the swan neck showing that it was not the air that cause microorganisms to go off.
Cheese
- Bacteria is added to milk
- Bacteria produces solid curds int he milk
- Curds are then separated from the whey
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Yoghurt (Should learn this properly)
- Milk is often heated( a method of sterilisation) to kill unwanted micro organisms
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