Question

list the possible constants in this experiment.

Explanation:

In a plant growth experiment (likely about water's effect), constants are factors kept same. Besides plant type, other constants could be type of soil (same for all pots), amount of sunlight (all plants get same light), or size of pots (same pot size).

Answer:

Constants:

1. Type of plants
2. Type of soil
3. Size of pots (or Amount of sunlight, etc.)