Cleveland is performing an experiment, testing to see if increasing the acidity of the soil in which sunflower plants are growing makes them flower sooner. In this experiment, what are some values that Cleveland will want to hold constant.

Answer choices (as many choices as you want)

the acidity of the water given to the plants

the temperature the plants are grown in

the day the plants begin to flower

the amount of water the sunflowers get

the amount of light the sunflowers get