A scientific investigation must be carried out under controlled conditions to eliminate possible undesired factors that affect variable relationships.
The expression 'controlled conditions' make reference to maintaining control of all factors that may affect the outcome of an experiment.
For example, to test the incidence of temperature on plant growth we need to control the water supply because this variable may also affect the results of the experiment.
In conclusion, a scientific investigation must be carried out under controlled conditions to eliminate possible undesired factors that affect variable relationships.
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