A group of your classmates want to see if fertilizer improves plant growth. They set up the following experiment: They planted three different types of plant seeds in three different types of soil. They placed all the planted seeds in either a dark or a light environment. Each plant was given the same amount of fertilizer. In a complete sentence, explain whether or not you think this is a good scientific design. What are two things that you could suggest for them to change in order to improve their experiment?
Since they are trying to test if fertilizer helps, no sunlight, they should give the plants the same amount of light. They should also give the plants different amounts of fertilizer.
