Answer:
1. The height and the amount of time it took to grow
2. The more sufficient sunlight it got, the more it grew in cm
3. The amount of water given was in a pattern, one was 1/4 cup and the other was 1 cup, it didn't really affect anything in regards of the height it grew, it had just enough to grow healthy.
4. It was plant 8 because it got the most sunlight hours out of all, a just right amount of water given, and it grew the most as the weeks went by, I can hypothesis that the more a plant got time to grow and sunlight to gain, the more to grew.
You could rephrase any of my answers of you want,
Hope this helps!