![]() The plants were grown in rooms free of insects or other pests, and they were spaced out adequately. The pH and carbon levels of the soil were also held constant throughout the experiment as these variables could influence plant height. Temperature was restricted to between 23 and 25℃. Light levels were fixed throughout the experiment, and the plants were exposed to 12 hours of light a day. Describe relevant previous research on your topic and note how your study may confirm it or expand it, or fill a gap in the research field.
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