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

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.

you did not attach the discourse, but i assume it to be the discourse on the origin and basis of inequality among men (the original titile in french is: "discours sur l'origine et les fondements de l'inégalité parmi les hommes"), also know as "second discourse". in this discourse, jean-jacques rousseau emphasizes that private property is the basis of all inequalities.

therefore, what enabled the old regime to maintain as long as it did was private property.