Answer
Michael identified the following factors that can effect the plant growth:
- Time of seed sowing
- Quality of soil
- Amount of water
- Temperature
- Color of light
Work Step by Step
Michael controlled the factors by:
- Sowing the seeds at the same time
- Keeping quality of soil the same
- Using the same amount of water for each plant
- Controlling the temperature to 70 degrees
- Keeping the color of light different for every plant
