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.

a

explanation:

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.