A scientist wants to see which type of light will make plants grow taller. The
scientist gives three plants an equal amount of water, fertilizer, soil, and amount
of growing space. The scientist gives one plant blue light, one plant yellow light,
and one plant red light. After a month the height of each plant is measured. What
would the independent variable in this experiment be?*
height of plant
type of plant
color of light
amount of water
Which of the following is a quantitative observation