Question

what is the students independent (change) variable?
the angle of the light shining on the light
the type of soil the plant is growing in
the brightness of the light shining on the plant
the temperature of the air in which the plant is growing

Explanation:

The two diagrams show plants under a light source with thermometers (suggesting controlled temperature). The key difference likely relates to light intensity (brightness), as it’s a common variable in plant growth experiments. Other options (soil type, light angle, air temperature) aren’t indicated as changed here.

Answer:

The brightness of the light shining on the plant