Ten pea plants were used to study the effect of fertilizer on plant growth. ten pea plants were the same height at the beginning of the investigation. All of the plants were placed in the same type of soil and given the same amount of water and sunlight. Five of the pea plants were given 0.5 grams of dry fertilizer every day while the other five pea plants were given 1.0 of liquid fertilizer every day . The following data were recorded.