What is the subject of the sentence after dinne several of us wanted to watch a movie

Carlo is wondering what causes plants to grow at different rates. carlo’s hypothesis is “plants will grow more when the day is longer.” what would be the difference between the test group and the control group in this experiment? type of soil type of plants exposure to sunlight method for measuring the growth

Will give 15 points for right answer

How do you pass the sat? i need sum pointers , and studying advice : (