Milli Liter wants to test the effects of nitrogen in fertilizer on the growth of plants. She takes soybean plants and plants them. She keeps all the plants in her room in front of the window except for plant number 5 which she keeps in the closet. She waters each of the plants every other day. She adds no fertilizer to Plant number 1. She adds a 10% nitrogen fertilizer to plant number 2. She adds a 20 % nitrogen fertilizer to plant number three. 3. She adds 25% nitrogen fertilizer to plant number 4. Finally she adds a 30% nitrogen fertilizer to plant number 5. Each day she measures the height of the plants. After a three-week period she obtains the following results: Plant number 1 = 4.5 cm Plant number 2 = 4.7 cm Plant number 3 = 5.3 cm Plant number 4 = 5.1 cm What is the dependent variable in the above reaction? * 10 points plant # 5 the height of each plant the amount of fertilizer used the number of hours per day the plants are exposed to light plant # 1