Students in a science class want to design an investigation to determine if fertilizer added to soil affects the average height of a plant over time. Which items would the students need to complete this investigation?
A tape measure, graph paper, a plant, and soil samples with the same amount of fertilizer
A microscope, a beaker, a plant, and soil samples with the same amount of fertilizer
A computer, a stopwatch, a plant, and soil samples with different amounts of fertilizer
A ruler, a calculator, a plant, and soil samples with different amounts of fertilizer