The three main types of scientific investigations are descriptive, comparative, and experimental. Which components are included in all three types of investigations?

a scientific question

an independent variable

a dependent variable

a procedure

a control group

a conclusion

A procedure components are included in all three types of investigations

Answer: D. Procedure

Explanation:

The cause and effect of a process would be studied in experimental investigations. However, in descriptive studies, relationship between the factors are not studies rather the detail of the process is studied.

In comparative investigation, several factors are compared and its effects are analyzed. In experimental investigations, experiments are carried out based on the hypothesis and then it is validated accordingly.

Validation is a must to prove and disprove the hypothesis. Therefore, experimental data and hypothesis are related.

The correct answer will be options-a scientific question, a procedure and a conclusion

Explanation:

The scientific investigation is performed to answer, understand and explain the natural events or phenomenon. The scientific investigation is performed through one of the types of scientific investigation that is descriptive, comparative, and experimental.

The common components of all types of investigation are:

1. Scientific question: the question is asked on the basis of observation made which could be answered.

2. Procedure: the sequential steps are followed to answer and test the scientific question.

3. Conclusion: the main aim of the investigation is the conclusion or inference to the scientific question which is an explanation of the question.