John notices that his mom waters the plants in their house every other day. He asks, "Will plants grow if they are not watered regularly?" His hypothesis is: Plants that are not watered regularly will not grow as large as plants that are watered regularly. In order to test his hypothesis, he conducts the following experiment.

a. Obtain two healthy plants of the same variety and size.

b. Plant each plant in the same type of pot and the same brand of potting mix.

c. Place both plants in the same window of the house.

d.Water one of the plants every other day with 250 mL of water.

e.Water the other plant once a week with 250 mL of water.

f.Measure the height of the plants once a day for one month.

Identify the experimental variable and 3 control variables and the experiment​