The <span>primary purpose of the first Earth Day celebration is to create a safe environment for all living beings to survive on planet earth. The concept of Earth Day was proposed by a peace activist in the year 1969. It is there for every people on earth to respect and protect nature. I hope the answer helps you.</span>
<span>closed-ended. hope that helped</span>
Answer:
<em>d) the construct validity of the study</em>
Explanation:
Construct validity relates to the extent in which assumptions from the operationalizations in your analysis to the conceptual frameworks on which those operationalizations were centered may genuinely be produced.
Construct validity is related to generalization, as is external validity.