Emilio's teacher told his class that a controlled experiment's results are valid only if one factor in the experiment is changed and all the other factors remain constant. why is this statement true?
changing several different factors in an experiment takes too much time.
changing several different factors in an experiment takes too many controls.
when only one factor is changed, you don't need to use a control.
when only one factor is changed, you can be more certain that it caused the results.
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Ответ:
1)Changing several different factors in an experiment takes too many controls.
This means that for every factor that is changed you need a control which has all the other factors stable - but with many factors, this might be undoable.
2) - and this is the best
When only one factor is changed, you can be more certain that it caused the results.
If this factor is the only thing that changes, you can safely assume that it caused the results!
Ответ:
Lungs of lies
Explanation:
Dun dun du