12A Relationships Among Organisms
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A student performed an investigation in which they planted two ivy plants in two separate containers. One of the containers had earthworms mixed in with the soil, and the other container had the same soil and no earthworms. The plants were given the same amount of water and exposed to the same amount of light. The student observed that after several weeks of growth, the plant exposed to earthworms appeared healthier and exhibited more growth. To conclude that the relation between the plant and the earthworm is an example of mutualism, what follow-up investigation could the student perform?

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