A scientist wants to investigate whether plants need sunlight to grow. The hypothesis being tested is: “Plants require sunlight to grow.” The scientist placed one tray of sunflower seedlings in the sun and another tray of sunflower seedlings in a cupboard in the laboratory The seedlings were watered and after 6 weeks the height of each seedling was measured. л Condition A: sunflower seedlings in the sun Condition B: Sunflower Seedlings in a Cupboard. Which variable/factor is being investigated (and therefore changed)?​