Which preliminary test has been generally discontinued because it uses a harmful reagant

What type of medicine to people take if they are lactose intolerance

Why is the first step in responding to life-threading situations to assess the situation?

When a researcher debriefs her participants, she: provides a detailed explanation of the study. removes their undergarments. tells them they can stop taking part at any time. provides an detailed explanation of the study, and tells them they can stop taking part at any time.