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

The correct answer to this open question is the following.

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 controlled.

When scientists do control experimentation, this means that the scientist can manipulate directly the experiment. The aim is to test just one variable at the time to find specific results. The correct name for the variable being tested is the "independent variable." This allows the scientist to adjust the effects or minimize the effects of the subject matter. That is what Louis Pasteur did in his experiment.

an economic reason that the south needed a reconstruction plan is that plantations, factories, and other businesses were destroyed during the war.

the government paid religious orders to provide basic education to native american children on reservations. in the late 19th and early 20th centuries, the bureau of indian affairs (bia) founded additional boarding schools based on the assimilation model of the off-reservation carlisle indian industrial school.