The theory of spontaneous generation was..

The theory of spontaneous generation was proposed by Aristotle. After Aristotle, many other scientists came in support of this theory.

The theory of spontaneous generation simply explains that the living matter originated from non-living matter. As soon as the theory was brought forward, contradictions arose in the scientific world with some scientists supporting the theory and the others denying it.

Some of the supporters of the spontaneous generation gave an example of how animals such as frogs can only be seen in the muddy areas. They thought that the non- living mud might have gave existence to the frogs.

However, in the future, with more scientific advancements, this theory was proved to be wrong.

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explanation:

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"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."