A petri dish containing only duckweed and a separate dish containing only salvinia are used for the control groups. The mass of the plants were initially all weighed the same. A third petri dish housed both species. Given all the same variables (besides space), the plants were subject to the same amount of light (14 hours) a day, same amount of distilled water as well as liquid fertilizer. Over the course of one week, the growth and the mass of the plants were monitored. By the end of 7 days, we observed the change in each species growth using their biomass, identifying the difference between the mass of the plants grown in the same environment, as opposed to grown separately.
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