The three main types of scientific investigations are descriptive, comparative, and experimental. Which components are included in all three types of investigations?a scientific questionan independent variablea dependent variablea procedurea control groupa conclusion

All three types of investigation begin with a scientific question, use a procedure to gather information, and reach a conclusion based on the findings. Independent and dependent variables are features of experiments, not required in descriptive and comparative investigations. A control group is also not included in every type; it is mainly used in experiments.

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