Rommell is studying for her final exam in Introduction to Ar…

Rommell is studying for her final exam in Introduction to Art History. To do this, Rommell is putting information into her memory in the hopes that it will stay there, unaltered, until she has to access the information during the test. This process of keeping information in her memory is called

You are evaluating the effect of different types of fertiliz…

You are evaluating the effect of different types of fertilizers on plant growth. You plant 12 tomato plants and divide them into three groups, where each group contains four plants. To the first group, you do not add fertilizer and the plants are watered with plain water. The second and third groups are watered with two different brands of fertilizer. After three weeks, you measure the growth of each plant in centimeters and calculate the average growth for each type of fertilizer. Which variable should I put on the x axis of my graph?