so you can know more about the topic before you start
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I would say that they could learn more about their subjects that they are experimenting with.
A manipulated variable. (Apex)
You should have everything set out correctly.Which means you should have the notebook your going to make observations with and have your safety tools.
it should have dates of what you did and some research, websites,
Theory gives direction to research. If you did not have any theory (or hypothesis) to test, you would be unlikely to be able to figure out what kind of experiment or observation you should be doing.