A shaduf was a tool used for irrigation. It was used to lift water.
The correct answer is conduct.
The ethical c<span>ode of conduct developed by the American Psychological Association (APA) refers to a guide of ethical standards and principles psychologists must adhere to, when conducting psychological experiments and research studies on human or animal subjects. Psychologists must adhere to APA's Code of Conduct to minimize any harm or distress a psychological study might pose for its participants. </span>
B. Limit use of the land.
