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Louis Pasteur


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

backed up by everyone and there is significant evidence proving it

Scientific Theory

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

spontaneous generation

- the idea that life could arise from nonliving matter

- some argued that air was needed for new life because air was a “life force” without which new life was not possible