1. a. Miracle Grow b. Height of plants c. Same amount of sunlight, same amount of water, all tomato plants, same soil, same humidity d. The group grown without any Miracle Grow
2. a. type of rose bush b. number of flowers c. same greenhouse
3. a. concentration of salt b. plant height c. all sunflowers, amount of water, same kind of soil, same level of humidity
4. a. humidity levels b. tree height c. tree left in normal conditions
5. a. amount of water b. pea plant height c. pea plant the only receives natural ways of receiving water
6. a. amount of food b. fish’s weight c. same type of fish, same kind of food
7. a. Lemonade juice b. appearance of the green slime c. the half sprayed with water
8. a. size of soccer ball b. time the ball stays in the air c. brand of ball, air pressure of the soccer balls