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In his experiment on spontaneous generation, Louis Pasteur changed only one thing between his experimental groups: whether or not the neck of the flask was broken. That means that his experiment was _____.

In his experiment on spontaneous generation Louis Pasteur changed only one thing between his experimental groups whether or not the neck of the flask was broken class=

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Louis Pasteur's experiment was A) controlled.

A scientist must change only one variable at a time to see if it is the one causing the observed change.

The scientist must keep all the other variables constant (i.e. control the variables)

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