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Louis Pasteur


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s broth boiled to kill bacteria – left open to the air with flask that had long curved dipped neck – no growth

s broth boiled to kill bacteria – left open – growth

s controlled: broth, boiling, area

s manipulated: openness to air

s responding: the broth with the flask collected the bacteria before it got into the broth and had no growth – the other one just collected the growth

Bacteria: can not travel against gravity (couldn't travel up the neck of the flask so just collected before it got into the flask)


Scientific Law
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backed up by everyone and there is significant evidence proving it


Scientific Theory
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backed by some people but there is some dispute, backed up by experiments, but not necessarily evidence.


spontaneous generation
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- the idea that life could arise from nonliving matter

- some argued that air was needed for new life because air was a