D. For every research situation/question, determine which of the following is the independent variable and the dependent variable. Write IV for independent variable and DV for dependent variable. Situation: You are interested in whether a higher minimum wage impacts employment rates. 1. minimum wage 2. employment rate Question: How well do different plant species tolerate salt water? 3. Plant growth, Plant wilting, Plant survival rate 4. The amount of salt added to the plants' water​