To operationalise variables, you must define how each is measured within your 9990 framework, and controls are the factors you hold constant. Ethics marks are usually detailed in the study's approval documents from the institutional board.
I say this because just last week, while helping my granddaughter with her science project on plant growth, we had to clearly write down what "healthy" meant and keep the sunlight the same for all pots. It is the same careful thinking.
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