Question

list all possible constants in this experiment.
zero drops of fertilizer
2 drops of fertilizer
4 drops of fertilizer
6 drops of fertilizer
(yellow drop = fertilizer)

Explanation:

To identify constants, we look for factors that remain unchanged across the experiment. The plants (same type), the pots (same type), and the light source (same) are constant as they don't vary with fertilizer drops.

Answer:

1. Type of plant
2. Type of pot
3. Light source (or amount of water, if water drops are constant; from the diagram, light and plant/pot are clear constants)