Meredith notices that different plant fertilizers are made up of different chemicals. Some fertilizers are high in nitrogen. Other fertilizers are high in phosphorus. Meredith hypothesizes that nitrogen-rich fertilizers are best to grow fruit crops such as strawberries. When she is designing her experiment, what should be her variable?
The variables would be the independent and dependent variables. Independent would be the soil that she uses, and the dependent variable would be how well it grows the fruit.