i) Balsam plant X grew taller while balsam plant Y wilted. This indicates that plant X received sufficient water while plant Y was not watered adequately. ii) In investigations, the only variable that should be kept the same is watering. iii) For plant Y to grow healthy, it needs to be watered adequately like plant X. iv) From this investigation, we can conclude that water is essential for plant growth and insufficient water causes plants to wilt.