Which of the following experimental designs would allow a researcher to determine the effect of mycorrhizae on plant growth?
O measure and compare the growth of two different plants that both have mycorrhizae associated with their roots
O measure and compare the growth of two different plants that do not have mycorrhizae associated with their roots
O measure and compare the growth of two different plants, one of which has had antifungal substances added to it and one that has not
O measure and compare the growth of two different plants, one of which has had antibiotics have been added to it and one that has notAnswer: measure and compare the growth of two different plants, one of which has had antifungal substances added to it and one that has not